I hate to burst your bubble...
CTG is simply the abbreviation for Cartridge. It's been stamped on several million S&W's.
The 415 is a meaningless assembly number used by the factory to mate parts after soft fitting. The only number that matters is the SN on the bottom of the grip frame (and repeated in several other places).
I doubt it was ordered in the 1940s. Several of its features were discontinued a decade or two earlier.
Unfortunately the barrel has been cut off.
That really hurts its value.
It's obviously been poorly refinished. That hurts its value even more.
If it's a family heirloom, carried on the job by a relative, then it's priceless.
From a collector standpoint, it's only a shooter at this point. It has no collector value. The gold tone hammer and trigger will make most folks run away fast.
Your link to the previous post is of a completely different model.
You have a .44 Special 2nd Model (no ejector rod shroud).
The link you attached is of the Wolf and Klar 3rd Model with the shroud.