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Was the 211D issued to be used or just for collectors?
The 211D was not available in Post Offices, had to be specially ordered from Washington, and never had gum. Postal records indicate that only 26 were sold. To use it for postage would have required going out of one's way to destroy a stamp obtained under special circumstances. It simply was not done.
While it is theoretically possible to say that one could have been used, as a practical matter it is impossible for anyone to prove that it happened.