Hi 06Triumph and welcome to the forum.
If the S/N number of the revolver is 122XXX, then the Standard Catalog shows it as a 32-20 Winchester Hand Ejector Model of 1905 4th Change manufactured/shipped in the broad range of years 1915-1940 (your number is toward the top at 144684).
Your serial number range makes sense, but your location of the numbers causes me to question it. The official location for the serial numbers is on the bottom of the butt of the gun. Indeed, s/n's frequently can also be found in various locations on S&W's including the rear face of the cylinder. Are there any numbers on the butt of the gun?
If you'll post some pictures of the revolver, our experts (I'm not one) can provide you with more information.
BTW, what do you mean about the numbers being "obliterated"?