James, I believe the consensus on those stampings are the assembly code was originally FF and sometime later the 10 was added, so not a good example.

My Model 2 revolvers are deciphered as follows:

Barrel, the assembly code should be read from the left side.
Cylinder, the code is stamped above the center pin, so read the code placing the pin under the number.
Butt-frame, on the left rear corner of the butt stock read the code from holding the frame in an upright position.

__________________
Gary
SWCA 2515