Falkland Islands
1937 KGVI definitive, original set of 12 values on cover cancelled with back-dated 'PORT STANLEY 3 JA 38' first day of issue datestamps. Of note is the 10/- duty which is the 1944 third printing. Most unusual.
Note: it is thought that a genuine canceller was 'used' during the early 1950's in the Manchester area of the UK. This, obviously, complicates the allocation of used stamps by their dated postmark to specific printings