It just made life easier for the post office back in the day ... they cancelled sheets of the postage due stamps before use and just applied them where needed. Saved time, I suppose.
I know postage rates of the period demanded it, but what I've always wondered about was the practicality of issuing 1/2 cent stamps and then going through the motions of precanceling them. It would seem the cost of man hours for printing, distribution, precanceling and usage of such low value stamps would be so much more greater than the denomination would suggest.
My old 1975 Scott catalogue shows two 1/2 cent postage due stamps, namely, a 1930 United States Scott#J69 carmine and a 1931 United States Scott#J79 dull carmine (rotary press). I'm guessing that Chasa's is the carmine one?
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