What is stamped on the left side of the receiver and wrist?

In the USAicon I think you can get good no4 mk2s complete as issued for very reasonable money. If the metalwork really is in good nick, has a full barrel (5 groove?) and that includes the rifling in the barrel and you are prepared or want a fun project because you like doing that sort of thing (like me) then yes go for it. I have seen some lovely restoration projects on here, something of a challenge.

Parts via online stores and ebay seem quite plentiful and reasonable money in the USA. I would aim for a stock that isnt "reconditioned" if you can.

I would try and talk the price down though.

;]

regards