Wow seems like there are some very knowledgeable lads on this thread.
Mine is a Blue Mark II Target Competition Target Model slab side 6 7/8 218-xxxxx with the Rosewood thumb rest grips. Very Very accurate and it doesn't get shot enough being back there in the safe.
Most of the ones I've seen are mostly stainless steel and I've often wondered the number of Mark II like mine that were produced and when.
Any one of the lads that know more then me care to advise ???
