Lot of 10 vintage envelopes, pre-stamped for 10 cent postage.

• All unused, but the backs, over time, have become sealed together.
• Based on them being 10 cents, I would estimate these to be from the 1974-75 period, when postage was 10 cents.
• 1 of the envelopes also has a 5 cent stamp affixed to it. 
• Classic 1970's piece!
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