It makes a difference.I think it's a .32
If it's a 32 it would be a 32 Safety Hammerless 1st Model. SN's ran from 1 in 1888 to 91417 in 1909.
If it's a 38 it would be a 38 Safety Hammerless 3rd Model. SN's ran from 42484 in 1890 to 116002 in 1898.
Jim