Hugh Campbell grouped together several similar but slightly different duplexes under type 3 and to avoid confusion I have retained his classification. They are most easily distinguished by the date when they were used
- 3(a) Medium arcs, number codes, used 1879 - August 1885
- 3(b) Longer arcs, letter codes, used 1886 - 1890
- 3(ba) Short arcs, letter codes, used 1885 - 1892
- 3(c) Shorter arcs, number codes, used November 1885 - 1894
- 3(d) Short bars, number codes, used 1890 - 1893
- 3(e) Short bars, number codes, used 1892 - 1893
There are also three datestamps that are similar
- 9a Long Arcs, number codes, used 1878 - 1883
- 9b Long Arcs, letter codes, used 1877 - 1882
- 13 Long arcs, letter codes, used 1886 - 1891

Top line (L-R): Duplex 3(a), Duplex 3(b), Duplex 3(ba), Duplex 3(c). Bottom line (L-R); Duplex 3(d), Duplex 3(e), Datestamp 9b, Datestamp 13
Type 3(c) 'QL' (No stops) within an oval of 34 unbroken broken rays. The letters are 6 mm high and the 'Q' has a straight tail slightly curved. The two parts are 4 mm apart. The unframed datestamp portion is 22.5 mm in diameter with letters 6 mm high, 'BRISBANE' around the top, 'QUEENSLAND' around the foot, and two bars at each side are about 3.5 mm long; in the centre, in three lines, are a numeral code, month and day, and year in two digits. There appears to have been more than one implement. Known used from 12 October 1885 - 17 August 1890. Codes seen are 1 - 20. Rated 2R - 5R
It is similar to Brisbane duplex type 3(a) but it was introduced afterwards (1879 - August 1885 for type 3(a) and October 1885 to 1890 for type 3(c)). It is also similar to Brisbane duplex type 3(d), but type 3(d) has shorter stops either side, the stroke of the Q is positioned very differently, and was also introduced later, being in use from XXXX to XXXX. It is also very similar to type 3(e), but type 3(e) has 38 rays and was in use later (1892 - 1893). Type 3(a) has longer arcs then type 3(c) and was in use earlier (1879 - August 1885)
- Code 1 (17 September 1886 - 17 August 1890) rated 3R - $18
- Code 2 (6 August 1888) rated 5R - $100
- Code 3 (26 April 1886 - 8 January 1889) rated 4R - $45
- Code 4 (2 February 1886 - 2 June 1890) rated 3R - $18, $60 on cover
- Code 5 (6 November 1885 31 November 1898) rated 3R - $30, $60 on cover
- Code 6 (6 August 1886 - 5 September 1889) rated 3R - $20, $75 on cover
- Code 7 (23 July 1886 - June 1890) rated 2R - $16, $75 on cover
- Code 8 (30 September 1886 - 24 September 1889) rated 4R - $36, $60 on cover
- Code 9 (30 November 1885 - 17 May 1890) rated 3R - $33
- Code 10 (10 November 1885 - 1888) rated 4R. $60, $100 on cover
- Code 11 (7 December 1885 - 23 July 1890) rated 4R - $45
- Code 12 (25 February 1886 - 22 January 1890) rated 2R - $16, $40 on cover
- Code 13 (27 July 1886 - 16 July 1890) rated 2R - $16, $30 on cover
- Code 14 (24 December 1885 - 13 November 1888) rated 2R
- Code 15 (9 December 1886 - 13 July 1888) rated 2R
- Code 16 (23 December 1886 - 13 December 1887) rated 2R
- Code 17 (8 April 1886) rated 2R
- Code 18 (14 March 1889 - 12 April 1889) rated 2R
- Code 19 (24 December 1886 - 9 May 1890) rated 2R
- Code 20 (3 February 1890 - 23 July 1890) rated 2R
Code 1
1886
Brisbane duplex type 3(c). Code 1. Dated 17 September 1886. Rated 3R
Brisbane duplex type 3(c). Code 1. Dated 2 October 1886. Rated 3R. Courtesy of Dave Elsmore
1888
Brisbane duplex type 3(c). Code 1. Dated 29 May 1888. Rated 3R
Brisbane duplex type 3(c). Code 1. Dated 26 September 1888. Rated 3R. Courtesy of Dave Elsmore
1889
Brisbane duplex type 3(c). Code 1. Dated 4 January, 1 and 9 August and 1 September 1889. Rated 3R
1890 Brisbane duplex type 3(c). Code 1. Dated 17 August 1890. Rated 3R
----------------------
Code 2
1888
Brisbane duplex type 3(c). Code 2. Dated 6 August 1888. Rated 5R. Courtesy of Dave Elsmore -----------------
Code 3
1886
Brisbane duplex type 3(c). Code 3. Dated 26 April 1886. Rated 4R
1887
Brisbane duplex type 3(c). Code 3. Dated 28 April 1887. Rated 4R
1888
Brisbane duplex type 3(c). Code 3. Dated 19 June 1888. Rated 4R
1889
Brisbane duplex type 3(c). Code 3. Dated 8 January 1889. Rated 4R --------------------
Code 4
1886
Brisbane duplex type 3(c). Code 4. Dated 2 February 1886. Rated 3R. Courtesy of Dave Elsmore
Brisbane duplex type 3(c). Code 4. Dated 17 May 1886. Rated 3R
Brisbane duplex type 3(c). Code 4. Dated o September 1886. Rated 3R
Brisbane duplex type 3(c). Code 4. Dated 17 November 1886. Rated 3R
1887
Brisbane duplex type 3(c). Code 4. Dated 29 January 1887. Rated 3R. Courtesy of Dave Elsmore
Brisbane duplex type 3(c). Code 4. Dated 13 October 1887. Rated 3R
1888
Brisbane duplex type 3(c). Code 4. Dated 4 August 1888. Rated 3R. Seen in the Queensland Stamp Collecting Facebook Group
Brisbane duplex type 3(c). Code 4. Dated 5 May and 31 August 1888. Rated 3R
1889
Brisbane duplex type 3(c). Code 4. Dated 17 April 1889. Rated 3R. Seen on Ebay
1890
Brisbane duplex type 3(c). Code 4. Dated 3 February and 2 July 1890. Rated 3R
---------------
Code 5
1885
Brisbane duplex type 3(c). Code 5. Dated 6 November 1885. Rated 3R. Seen in Prestige Philately auction no 139 lot no 345
Brisbane duplex type 3(c). Code 5. Dated 30 November 1885. Rated 3R. Courtesy of Dave Elsmore
1886
Brisbane duplex type 3(c). Code 5. Dated 27 March 1886. Rated 3R. Seen on Ebay
1887
Brisbane duplex type 3(c). Code 5. Dated 10 March and 1 August 1887. Rated 3R
1888
Brisbane duplex type 3(c). Code 5. Dated 18 March 1888. Rated 3R
Brisbane duplex type 3(c). Code 5. Dated 29 September 1888. Rated 3R
Brisbane duplex type 3(c). Code 5. Dated 31 November 1888. Rated 3R -----------------
Brisbane duplex type 3(c). Code 6. Dated 6 August 1886. Rated 3R. Courtesy of Dave Elsmore
Brisbane duplex type 3(c). Code 6. Dated 24 August 1886. Rated 3R
Brisbane duplex type 3(c). Code 6. Dated 27 November 1886. Rated 3R. Courtesy of Dave Elsmore
1887
Brisbane duplex type 3(c). Code 6. Dated 10 May 1887. Rated 3R. Courtesy of Dave Elsmore
Brisbane duplex type 3(c). Code 6. Dated 29 April, 2- July and 31 December 1887. Rated 3R
1888
Brisbane duplex type 3(c). Code 6. Dated 16 March and 28 September 1888. Rated 3R
1889 Brisbane duplex type 3(c). Code 6. Dated 29 May and 16 July 1889. Rated 3R
Brisbane duplex type 3(c). Code 6. Dated 5 September 1889. Rated 3R
------------------------
Code 7
1886
Brisbane duplex type 3(c). Code 7. Dated 23 July 1886. Rated 2R. Courtesy of Dave Elsmore
Brisbane duplex type 3(c). Code 7. Dated 30 October and 12 November 1886. Rated 2R
1887
Brisbane duplex type 3(c). Code 7. Dated 4 February 1887. Rated 2R. Seen in the Queensland Stamp Collecting Facebook Group
Brisbane duplex type 3(c). Code 7. Dated 2 April and 10 October 1887. Rated 2R
1888 Brisbane duplex type 3(c). Code 7. Dated 31 July and August 1888. Rated 2R
1889
Brisbane duplex type 3(c). Code 7. Dated 4 May and 4 September 1889. Rated 2R
Brisbane duplex type 3(c). Code 7. Dated 4 November 1889. Rated 2R
Code 8
1886
Brisbane duplex type 3(c). Code 8. Dated 30 September 1886. Rated 4R. Seen on Ebay
1887
Brisbane duplex type 3(c). Code 8. Dated 4 June 1887. Rated 4R. Seen on Ebay
1889
Brisbane duplex type 3(c). Code 8. Dated 29 June 1889. Rated 4R
Brisbane duplex type 3(c). Code 8. Dated 5 September 1889. Rated 4R
Brisbane duplex type 3(c). Code 8. Dated 24 September 1889. Rated 4R. Seen on Ebay
------------------
Code 9
1885
Brisbane duplex type 3(c). Code 9. Dated 30 November 1885. Rated 3R. Courtesy of Dave Elsmore
1886
Brisbane duplex type 3(c). Code 9. Dated 25 June 1886. Rated 3R. Courtesy of Dave Elsmore
Brisbane duplex type 3(c). Code 9. Dated 24 January, 10 May and 16 August 1886. Rated 3R
1889
Brisbane duplex type 3(c). Code 9. Dated 22 June 1889. Rated 3R
Brisbane duplex type 3(c). Code 9. Dated 22 November 1889. Rated 3R
1890
Brisbane duplex type 3(c). Code 9. Dated 28 May 1890. Rated 3R
Brisbane duplex type 3(c). Code 9. Dated 17 May 1890. Rated 3R -------------------------
Code 10
1885
Brisbane duplex type 3(c). Code 10. Dated 10 November 1885. Rated 4R
1886
Brisbane duplex type 3(c). Code 10. Dated December 1886. Rated 4R
1887
Brisbane duplex type 3(c). Code 10. Dated 28 March 1887. Rated 4R
1888
Brisbane duplex type 3(c). Code 10. Dated 1888. Rated 4R. Seen on Ebay ---------------
Code 11
1885
Brisbane duplex type 3(c). Code 11. Dated 7 December 1885. Rated 4R. Courtesy of Dave Elsmore
1887
Brisbane duplex type 3(c). Code 11. Dated 12 April 1887. Rated 4R
1888
Brisbane duplex type 3(c). Code 11. Dated 15 August 1888. Rated 4R
1889
Brisbane duplex type 3(c). Code 11. Dated 1 June 1889. Rated 4R
Brisbane duplex type 3(c). Code 11. Dated 7 December 1889. Rated 4R
1890
Brisbane duplex type 3(c). Code 11. Dated 7 December 188524 February and 23 July 1890
---------------
Code 12
1886
Brisbane duplex type 3(c). Code 12. Dated 25 February and 19 May 1886. Rated 2R
1887
Brisbane duplex type 3(c). Code 12. Dated 1887. Rated 2R
Brisbane duplex type 3(c). Code 12. Dated 12 October 1887. Rated 2R. Courtesy of Dave Elsmore
1888
Brisbane duplex type 3(c). Code 12. Dated 1888. Rated 2R
Brisbane duplex type 3(c). Code 12. Dated 23 August 1888. Rated 2R. Seen on Ebay
Brisbane duplex type 3(c). Code 12. Dated 23 August 1888. Rated 2R
1889
Brisbane duplex type 3(c). Code 12. Dated 10 January 1889. Rated 2R
Brisbane duplex type 3(c). Code 12. Dated 4 January, 5 February and September 1889. Rated 2R
1890
Brisbane duplex type 3(c). Code 12. Dated 7 January 1890. Rated 2R
Brisbane duplex type 3(c). Code 12. Dated 22 January 1890. Rated 2R. Courtesy of Dave Elsmore
-------------------
Code 13
1886
Brisbane duplex type 3(c). Code 13. Dated 27 July 1886. Rated 2R. Seen in Leski auctions
1887
Brisbane duplex type 3(c). Code 13. Dated 15 July 1887. Rated 2R
1888
Brisbane duplex type 3(c). Code 13. Dated 27 March 1888. Rated 2R. Courtesy of Dave Elsmore
Brisbane duplex type 3(c). Code 13. Dated 5 June 1888. Rated 2R
Brisbane duplex type 3(c). Code 13. Dated 13 July 1888. Rated 2R
Brisbane duplex type 3(c). Code 13. Dated various dates in 1888. Rated 2R
1889
Brisbane duplex type 3(c). Code 13. Dated 11 January and 9 August 1889 Rated 2R
Brisbane duplex type 3(c). Code 13. Dated 15 August 1889. Rated 2R. Seen in a private collection
Brisbane duplex type 3(c). Code 13. Dated 3 October 1889. Rated 2R. Seen in a private collection
1890
Brisbane duplex type 3(c). Code 13. Dated 6 March and 16 July 1890. Rated 2R
---------------
Code 14
1885
Brisbane duplex type 3(c). Code 14. Dated 24 December 1885. Rated 2R. Courtesy of Dave Elsmore
1887
Brisbane duplex type 3(c). Code 14. Dated 2 February 1887. Rated 2R
1888
Brisbane duplex type 3(c). Code 14. Dated 29 February 1888. Rated 2R
Brisbane duplex type 3(c). Code 14. Dated 13 November 1888. Rated 2R. Seen on Ebay
------------------------
Code 15
1886
Brisbane duplex type 3(c). Code 15. Dated 9 December 1886. Rated 2R. Courtesy of Dave Elsmore
1887
Brisbane duplex type 3(c). Code 15. Dated 7 September 1887. Rated 2R. Seen in a private collection
1888
Brisbane duplex type 3(c). Code 15. Dated 13 July 1888. Rated 2R ------------------
Code 16
1886
Brisbane duplex type 3(c). Code 16. Dated 23 December 1886. Rated 2R. Seen on Ebay
1887
Brisbane duplex type 3(c). Code 16. Dated 14 February 1887 1886. Rated 2R. Courtesy of Dave Elsmore
Brisbane duplex type 3(c). Code 16. Dated 13 December 1887 1886. Rated 2R. Seen in the Marius Wytenburg Brisbane GPO Exhibit
-----------------
Code 17
1886
Brisbane duplex type 3(c). Code 17. Dated 8 April 1886. Rated 2R -----------------
Code 18
1889
Brisbane duplex type 3(c). Code 18. Dated 14 March 1889. Rated 2R. Seen on Ebay
Brisbane duplex type 3(c). Code 18. Dated 12 April 1889. Rated 2R --------------------
Code 19
1886
Brisbane duplex type 3(c). Code 19. Dated 24 December 1886. Rated 2R. Seen on Ebay
1889
Brisbane duplex type 3(c). Code 19. Dated 10 June 1889. Rated 2R. Seen in Corinphila auction no 291 lot no 10150
Brisbane duplex type 3(c). Code 19. Dated 25 October 1889. Rated 2R
Brisbane duplex type 3(c). Code 19. Dated 12 December 1889. Rated 2R
1890
Brisbane duplex type 3(c). Code 19. Dated 9 May 1890. Rated 2R
------------------------------
Code 20
1890
Brisbane duplex type 3(c). Code 20. Dated 3 February 1890. Rated 2R
Brisbane duplex type 3(c). Code 20. Dated 14 April 1890. Rated 2R. Seen on Ebay
Brisbane duplex type 3(c). Code 20. Dated 23 July 1890. Rated 2R. Seen in a private collection
---------------------