Beautifully made pistols. Their high polish blue would rival anyone in the industry at the time.

They are a locked breech design w/a rotating bbl plus a separate breech unit. Very different
Easy to loose trigger parts out of during field stripping as they can just fall out of the frame after the slide & bbl is removed.
Not uncommon to find the disconnector sear trip missing.

They will go full auto and empty the entire magazine more than any other handgun I've seen. The delicate sear edge is to blame for that.
Careful putting the breech back in, turning it the wrong way jambs it in pretty good, but don't be tempted to go for the pliers,,it will turn back over.