My Blackhawk 45 convertible is only a couple years old. it's definitely the big frame, two-digit serial prefix.
Seems to me the older first Vaqueros, were all built on the magnum frame, as are the Blackhawk, Super Blackhawk, Super Blackhawk Bisley.
Then the New Vaquero and the newer Flat-Tops are in the smaller frame.
Yes.
I have no idea what 257x50 is trying to convey.
That there are 2 size of frames.
There are 45 convertibles in both sizes.
Don’t fire full house loads in the smaller frame.
Edit. I reread. Flat tops to me are the old 3 screw flat tops.
Sorry
