I have one Singer 66-18 that is a crinkle repaint. It's a decent job so I have no idea what's under it.
I also have one refurbed 66-1 with a conversion low shank pressure foot rod a darning pressure foot tension control, and a Revco Reverser stitch control which doesn't work worth a hoot. What's under that one I do not know either.
The handgun that Singer made in WW II was the 1911a1. They didn't loose or not get the contract, they got another contract that was far more important to the war and the pistol went to another manufacturer. Singers ability to make lots of identical small parts gained them the contract to manufacturer the Nordon Bomb sight that was used in our B-17s and many other bombers during the war. The bomb sight was an extremely precise mechanical computer and Singers ability for high quality manufacturing made it possible.
Joe