Welcome to the Forum.
We need more info. Is this number, 496861, taken from the butt of the revolver? Are there any letter prefixes, like a "V", "C", "S", "D", or a "K" in front of the digits?
Please post pictures. At the least, all of the markings that appear on your gun.
BTW, "ctg" is an abbreviation for "cartridge". It is NOT part of the revolver's name or model designation.