This is a First Day Cover that has been hand signed by the great, Jack Youngblood. The cachet has been authenticated and slabbed by PSA/DNA. The serial number is verifiable online using PSA/DNA #84092312. The cover comes encapsulated in a tamper-proof cover. 100% authentic signature from St. Louis Rams legend, Jack Youngblood. A great gift idea for a St. Louis Rams or MLB collector.