Quote Originally Posted by charub View Post
I have a 25mm HW 50 ( not sure of age, got to be 20 yrs +) but it has a synthetic seal.
That is correct, the Mk1 has the 25mm leather seal then later on around early eighties it had the synthetic seal up until the new 99/50 came along with the 26mm seal.Hope that helps clarify a little.

The MK1 stock has no but pad & finger grove on the fore end ,it has the fixed post fore sight & early version of the rear sight, the later synthetic version has the modern sights & stock.