I'm new to the postmark side of philately. I found this in a recent purchase. I'm thinking it's the same as the Boulder cancellation on page 139 of 'Western Australia -West Australian Study Group'. Part of a duplex. Anybody confirm it.
Looking at "Postal Markings Illustrated' from the Western Australia Study Group, I would say your Boulder postmark is duplex type DxF-b, known with canceller numbers 1-6 and 8.
Recorded dates of usage are from 8th May, 1899 to 24th March, 1902.
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Posted 02/14/2026 04:14 am
