Hey everyone, New to the forum, but I found some great info to date an awesome little .22 I just picked up. My date code is OH, so I know it was manufactured in July of either 1939, or 1961. How do I know when, the guy I bought it from tells me it was made in the 40's. Was there any difference between the 2 years of production? Stampings on the barrell? Thanks in advance for all the answers!