New York, NY, Sept. 11, 2001, postmark handstamp
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.
X-Stamper Scandinavia A/S of Albertslund, Denmark, patented this self-inking marking stamp. The company developed an acrylic that is impregnated with ink that eliminates the need for an ink pad. This has become the preferred technology for postmark, cancel, and auxillary marking devices. Sun State Marking Corporation is one of many licensees for producing X-Stamper devices.
This handstamp was collected from a postal window on the ground floor of the Church Street Station Post Office, New York, New York, which serviced the World Trade Center. The stamp was last used on September 11, 2001.