My SC has the firing pin access screw on the upper right side of the receiver when you are looking down the barrel. I'm not looking at the gun, but I think the S# is 177128. I'll have to check. No pistol grip and a very nice piece of wood. I shoot it all of the time. It is about a 70/30 gun. The original owner was a famous businessman of the era and lived in San Fransisco. He probably shot at the Bohemian Club.
Its got a pretty serious chip missing at the wrist along the lower tang.