I'm a new member who recently purchased an Officer's Model Match 22 rf serial no. 74,XXX which places it as a 1957 gun (I think). Which grips would this gun have originally come with, fully checkered as in the picture below or with partially checkered grips with slight thumb rest on left grip (similar to early Python)? I've searched the net and found examples with both type of grips. Were the grips pictured below used on early guns and then transition to the Python type grips later?