I've got a couple of those picks as well. I got one from Mike Gordon back in the 90s and another from Barry Sless who got it for me from Phil's tech. Hang on to it. It's a great pick and they won't make any more, despite pleas from both Mike and Phil. It's not just a standard 1.5mm Stubby but a graphite 1.5mm Stubby. If ever you want to let it go, let me know! I was all into the Adamas graphite picks for bass until I discovered this one. I still love them for guitar, but as Mike said, the key to the Stubby is not only the stiffness, but the stiffness combined with the thinness.
Edwin