Available for sale is an AMAZING Clay Matthews on-card autographed 2015 Topps Diamond insert card, serial numbered 1/5, and being the first card made in the series also the most valuable card in the series!!! The Topps Diamond series was only produced for one year back in 2015, which has helped it to become one of the more desirable and sought after series in recent memory by collectors and investors alike. Please feel free to contact me with any questions. Thank you very much for viewing my item!!