Sorry it took so long to get back to you. My computer has been down for a few days. Yes, the OSI issued M-36 was stamped with "OSI" on the right side of the frame below the cylinder, just above the trigger. I never saw one in OSI use without the stamp. The OSI issue was equiped with the S&W "banana" style grip panels. A lot of the agents didn't care for that grip so we authorized a S&W grip panel that converted it to a square butt configuration. Personally I liked the banana grip. Hope this answered your question. I am working from my lap top and not sure if I know how to upload pics; however, I will try in the next day or two.

Keep shootin'........Ric Ferron