well
Best as I could determine - I saw 1919 as well. No logistical problem really - ink stamping was usually within a week or two of the actual sale date - the stamps themselves could and would be purchased prior to their issuance. Many of the known still sealed Polar packs for example were packaged in 1909/1910 and have 1910 stamps but cancels in the 1920's all the way up to 1950's.
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