The serial # for that grip is 140777. Most of the time that is exactly how they stamped them. Always 3 number group per stamp with 2 stamps making up the number. It was for internal use in order to keep all the parts together and they stamped willy nilly. At the time the thought was the factory was going to be the only interested party but comes in handy now to be able to tell if grips are original to gun.