Oi! You're not supposed to show people where they can find out this sort of thing for themselves.
It works like this:
-They post the question here.
-We confidentelly state that if they just give us the serial number, we'll tell tham what mk it is.
-
We go to that site to get the info
-We sagely post the answer on here to make us look like all knowing collectable airgun gurus. OP is awed and humbled by the extent of our knowledge.
-A true vintage airgun geek like IJ turns up and not only tells the OP what the year, month, day and hour of manufacture was, but also that the bloke who assembled it was called Trevor, and that he was missing the third finger from his left hand which explains why the gun has the tendency to shoot to the left, and what he had on his sarnies that day.
Bad form and all that.