Type 4 A duplex (obliterator) 'QL' (No stops), in thick letters 5 mm high within an oval of 34 thickish unbroken rays. The datestamp portion is a framed circle, 24.5 mm in diameter, with 'Brisbane' round the top, 'Queensland' at the foot and two short vertical bars on either side between them; the date is in two lines in the centre (year in two figures), with a code letter above
The date stamp portion of the duplex is very similar to Brisbane date stamp Type 10, which also has two short vertical bars. It can also be confused with Brisbane date stamp Type 16 which has one short vertical bar on either side. The duplex type 4 and the date stamp Type 10 can also be distinguished, when it is unclear if the obliterator portion is present, by their dates, as Type 10 was in use earlier, from 1883 to 1890. However date stamp type 10 is also known used from August 1893 - August 95 in conjunction with Codes A, L and W, so extra care should be taken with these dates and codes
Dates range from 9 March 1892 to 20 December 1895. Campbell states that the code letters ranged from A to W but that he has only seen D, L and W. I therefore only list codes seen by Campbell or by me. These are A, C, D, E, H, K, L, M, N, P and W. Rated Rare - 5R. The detailed breakdown is as follows:

Brisbane duplex type 4 (from Campbell) - the foot of the Q is actually usually straight, not slanted, suggesting that more than one implement was in use
Brisbane duplex type 4 Code A rated rare. Dated 9 November 1892- Code A (9 March 1892 - 18 December 1895) rated Rare - $10, $60 on cover
- Code C (27 March 1893 - 9 October 1895) rated 5R - $50, $100 on cover
- Code D (10 May 1892 - 3 July 1894) rated 5R - $60, $75 on cover
- Code E (20 March 1894 - 25 May 1895) rated 5R - $100 on cover
- Code H (27 June 1892 - 31 October 1895) rated 2R - $16, $75 on cover
- Code K (13 September 1894) rated 5R - $75, $100 on cover
- Code L (20 July 1892 - April 1894) rated 4R - $50, $75 on cover
- Code M (25 June 1892 - 25 November 1895) rated 4R - $40, $75 on cover
- Code N (2 July 1892 - 11 July 1895) rated Rare - $12, $75 on cover
- Code P (23 April 1895 - 20 December 1895) rated 4R - $40
- Code W (3 July 1893) rated 5R - $90

Brisbane duplex type 4 (from Campbell) - the foot of the Q is actually usually straight, not slanted, suggesting that more than one implement was in use
1893
Brisbane duplex type 4 Code A rated rare. Dated 8 June and 21 December 1893
1894
1895
Unclear or unknown date
Brisbane duplex type 4 Code A rated rare
Code C
1893
1895
Code D
1892
1893
Brisbane duplex type 4 Code D rated 5R. Dated 29 November 1893. Seen in Millennium auction no 52 lot no 459
1894
Code E
1894
Brisbane duplex type 4 Code E rated 5R. Dated 10 November 1894
1895
1895
Code H
1892
Brisbane duplex type 4 Code H rated 2R. Dated 15 September 1892. In the the Marius Wytenburg Brisbane GPO exhibit
1893
1894
1895
Unclear or Unknown year
Code K
1894
Unclear date
Code L
1892
1893
1894
Unknown year
Code M
1892
Brisbane duplex type 4 Code M rated 4R. Dated 14 September 1892. In the the Marius Wytenburg Brisbane GPO exhibit
1894
1895
Code N
1892
1893
1894
1895
Unclear or missing year
Code P
1895
Brisbane duplex type 4 Code P rated 4R. Dated 23 April, 21 October, 17 December and 20 December 1895
Code W
1893
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