I have a S&w six shot 4.25 inch barrel revolver. 32 caliber? On the barrel side is " ?? Long OTG ". On top of the barrel is "Smith and Wesson Springfield, Mass. U.S. Pat. " Serial number--"288460". Has what appears to be a small crosshatch black plastic or bakelite grip with the fancy S&W logo. Looks pretty old. Any idea of its current value?