Ahh , Ahem,
All 625s beginning with the -2 iteration regardless of barrel length
were (Are) round butt frames.
Hard to realize that even as early as 1988 S & W manufactured a
complete line of revolvers with exclusively round butts.
But, remember, all the early 625s were shipped with Pachmayr
gripper grips which are essentially round conversion grips.
It's only later now that we collectors feel that the only properly
shod round butt N frame is wearing combat stocks.
Good Luck
Allen Frame