IIRC, the 4" versions were SB and the 3" versions had round butt. Then again, someone could have put a 4" tube on a 3" RB, ya never know.

I love my Model 65 3" and will buy 'em when I find 'em in nice shape. They are highly regarded for many of the best reasons . . .

1. Fast from the holster
2. Amazingly accurate
3. Very fast recoil recovery time to the next target when firing double action handgun matches
4. Fantastic LOOKING
5. Fast pointing
6. Great balance and handling
7. Relatively easy to conceal and carry!
8. Mine shoots dead-on to correct point of aim!!! Most of 'em do too!!!

I'll never get rid of mine . . . and have won many a handgun match with it.