Thanks for all the info and suggestions lads
I've already had several offers to buy via PM and to clarify things..
I bought the rifle from a collector in England, Portsmouth to be exact, so it's not a European rifle as such, I simply had it delivered to my house in Spain
Apart from the usual marks, there is definitely no Mk1, Mk11 or any other mark on the breech or anywhere else, I have lost the info somewhere, but shortly after I bought it, I contacted Feinwerkbau with the serial number and was informed that it was a Mk1 from the late 70's, probably 1978, but this cannot be guaranteed or even verified I don't suppose, even so, the rifle is in superb condition and you only have to cock and fire it to tell the quality.

Cheers
Nige