Robert for anyone to give you any information, you have to give us a lot more information.
It is like saying, well, I have a fin-tailed car, and when was it made. Well, in the 1950's... <img border="0" title="" alt="[Wink]" src="wink.gif" />
So, if you can give us any proofs and acceptance markings on the left or right, caliber, is there a date on the top, if there isn't then tell us that, full serial number and suffix, pictures of the entire gun, etc.
Look under technical information for a print out you can use as a guideline.
Ed