That's an excellent idea. Here's a picture I found on Ebay for a John Entwistle signature Bass pick:

This was a comercially available mass produced item, so it's an acurate representation of his signature. Here are my pics:

For the record, I know 100% for sure that it's authentic, because it was given to me as a gift by a close friend and manager of a prominent music store who met John Entwistle at a NAMM show where he acquired it. I took the pictures with my cell phone, so the resolution's not that great. But you can still make a good comparison. (Message edited by rami on July 11, 2008)