Perusing through an old gun book...

Yes, it is a National Match .38 Special. The barrel without locking lugs and the "barrel return spring" were peculiar to that model. The magazine, too, was unique. There were three variations of this model if I remember correctly. The first and second variations had some functioning problems and these were fixed in the Mark III. I've had a couple of those guns over the years and they were accurate and fun to shoot.

I also have a copy of that same book. It is very useful and I have referred to it many times.

- - - -Buckspen

I'm glad you got an answer. It's out of my league.

The only thing I could think of is that I'm re-reading The Black Rifle on the hopper this week.

I am reading The Gun on mine.