The Serial Number is 245,XXX so that puts it at or close to the last year of production 1939.
I wanted to teach kids with it but was concerned about them letting go of the hammer while pulling it back. After some testing, I don't think it will fire unless pulled all the way back and trigger engaged.
A time or two, I've thought about dropping it off at Dustin's for a thread job.
I have three or four of the single shots that has the charging handle at the rear. Never a problem with the kids. Some of them don't have the strength yet and we have to help them, but that is just part of the fun for me. I like these old 22's!!