National Postal Museum
New York, NY, Sept. 11, 2001, postmark handstamp
September 11, 2001
This device is often referred to as a "round dater" by window clerks and other postal staff. It is a self-inking device with the ink impregrenated within the acrylic die. It is used for marking receipts, such as insurance slips, as well as upon registered parcels and letters along seams. It is not ordinarily used for postmarking mail.
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