is this off an FN20 turret?

thanks

Alan is still around……!
 

Are you able to suggest which turret this control is fitted to please AM?

This is from the A.P. for the FN121 which was based on the FN120 – which was derived from the FN20.   To be honest, they* were all pretty similar.

You may need to find some Part Numbers (and a Parts List to compare them with).

(* includng types such as the FN4 and FN82 as well).