Tip: When seeking ID, it is ALWAYS best practice, to indicate EVERY known aspect of the item.
You may have offered a copy of the text of the Postmark
what type of paper are they are on etc ?
Anything on the back?
They appear to be on card?
Perhaps they are part of "unused Stationery"
of the period.
But you will need a
Date appears to be December 10th 1942