OH, this is an early one. Now, I am not well versed on the really early ones like this, so this is a good education for me as well. I see many differences than the later versions I am used to. Of course the number of screws securing the birdle is one. The design of the locking lugs, for the receiver to barrel lock up. The design of the overall engraving and the way the balls of the receiver are engraved. Is this the gun we have been talking about? Good find!