Yeah, the Mod 58 is an N frame revolver and will fit any holster for N frames like the 25/625, 29/629 and 57/657. Yours is simple a fixed sight N frame in .41mag...and a damn nice revolver. Congrats.
...Then I found a place it's dark and it's rotted
it's a cool, sweet kinda-place where the copters won't spot it.