Insufficiently pre-paid handstamps were used to indicate that the correct postage had not been applied. When the handstamp was first introduced, overseas mail with insufficient postage was stamped in Brisbane with an "INSUFFICIENTLY PRE-PAID" handstamp and then usually sent to the Dead Letter Office before being returned to the sender. However, Australian mail appears to have still been delivered.
By 1881 it had become the practice to forward overseas-bound insufficiently pre-paid letters to their intended destination provided that they bore single-rate franking for the cheapest route.
After Queensland joined the Universal Postal Union in October 1891, the treatment of underpaid mail for overseas was governed by U.P.U. regulations, and mail insufficiently pre-paid was stamped with accountancy markings and then forwarded to the intended destination, with the deficiency and a fine of the equivalent amount being recovered from the recipient
It is a framed handstamp with 2 lines, the top line reading 'INSUFFICIENTLY' and the bottom line 'PRE-PAID' within a rectangular frame 37½ x 9 mm with rounded corners. Seen used from 1866 - 1882 and rated 3R
- Insufficiently Pre-Paid Handstamp (31 August 1866 - 25 September 1882) rated 3R
1866
From Yaamba to London, England dated 31 August 1866 with an "Insufficiently pre-paid" handstamp rated 3R. Seen in Prestige Philately auction no 97 lot no 1045
From an unknown location to Bendigo, Victoria dated 1866 with an "Insufficiently pre-paid" handstamp rated 3R. Seen on the Internet
From Charleville to Aberdeen, Scotland dated December 1866 with an "Insufficiently pre-paid" handstamp rated 3R. Seen in Campbell, p. 112
1879
From Cardwell to Toronto, Canada dated 4 July 1879 with an "Insufficiently pre-paid" handstamp rated 3R. Seen on Ebay
1881
Cambooya to Dublin, Ireland dated 2 April 1881 with an "Insufficiently pre-paid" handstamp rated 3R. Seen in Abacus auction no 234
From Mackay to Brandon, England dated 18 April 1881 with an "Insufficiently pre-paid" handstamp rated 3R. Seen in Campbell, p. 115
1882
From Cooper's Plains to London, England dated 21 July 1882 with an "Insufficiently pre-paid" handstamp rated 3R. Seen in Cavendish auction no 662 lot no 2229
From Warwick to Columbia, South Carolina, USA dated 25 September 1882 with an "Insufficiently pre-paid" handstamp rated 3R. Seen at Abacus auction no 234 lot no 146
From Warwick to Columbia, South Carolina, USA dated 25 September 1882 with an "Insufficiently pre-paid" handstamp rated 3R. Seen at Abacus auction no 234 lot no 146




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