It is a Baggage clearance stamp. They were placed on luggage to show that they had been cleared / inspected by US Customs. There is a listing of these in an old issue of The American Revenuer. Link to issue: https://www.revenuer.org/pdf/US%20C...20Stamps.pdf
Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Stamp Community assumes no liability for errors. Copyright 2005 - 2026 Stamp Community Family - All rights reserved worldwide. Use of any images or content on this website without prior written permission of Stamp Community or the original lender is strictly prohibited. Privacy Policy / Terms of UseAdvertise Here