3 inch round butt, will tend to command higher prices, than the four inch square butt.
The earlier 13-1, or 13-2, in either configuration, will command higher prices than later ( non-pinned, non-recessed Cylinder ) ones.
So, probably, for a 13-3, 4 inch, sq butt, in 95-ish condition, a usual price where it will sell 'reasonably soon', would be around $400.00
And, ditto, 3 inch, rd Butt, $400s - low 500s
Far as I know...
And, higher asking prices than these are not uncommon, for 13-3 and newer, if usually taking much longer to sell, or not selling at all.
As are lower prices, not uncomon, which will sell better, sooner.
Really lovely Revolvers...all...
And also, at least in my own acceptance or understanding, though chambered for he .357 Cartridge, they were intended for only occasional use of that Cartridge, and not for shooting .357s as a steady diet.