Anything is possible... the furthest one down, slight indentation, is the full cock and the one in that picture is worn or filed down a bit.
The other parts, as you may know, are the hand that moves the cylinder and the lock that locks the cylinder / rounds in line with the barrel.
I've done gunsmith work on Colts, timed them etc... I've never had a trigger spring break.
The 'sear' is simply the extension on the trigger that mates with that / those notches...
This is a healthy Hammer with a distinct full cock cut.
