This is a First Day Cover that has been hand signed by the great, Gaylord Perry. The cachet has been authenticated and slabbed by PSA/DNA. The serial number is verifiable online using PSA/DNA #84092190. The cover comes encapsulated in a tamper-proof cover. 100% authentic signature from Seattle Mariners legend, Gaylord Perry. A great gift idea for a Seattle Mariners or MLB collector.