That’s not flame cutting, the divot is a factory feature. I’d rate the gun at least 95% with the new pictures.

When the hammer is at rest, the cylinder needs a little wiggle room to function. It should be solidly locked when the gun is cocked and when the hammer falls and the trigger hasn’t been released. This is when the bullet in the chamber needs to be perfectly aligned with the bore and locked in place!
Froggie