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Also like to point out the 1st and 3rd stamps are possible silent precancels. Many PO's would precancel Postage Due so it was ready to go as needed! They used pen, crayons, paint brush, and a variety of handstamps!
Yep. I never understood the need for canceling postage due stamps, myself. When you paid the postage due, you were handed the item. If you had the item, the postage due had been paid...nobody would reuse a postage due stamp because it meant extra money to be paid. I guess that's one of the costs of bureaucracy and the regulations thereof.