National Postal Museum
New York, NY, Sept. 11, 2001, postmark handstamp
September 11, 2001
Postal staff often refer to this device as a 'round dater'. It is a self-inking device with the ink impregnated within the acrylic die. It is used for marking receipts such as insurance slips as well as registered parcels and letters. It is not ordinarily used for postmarking mail.
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