Thank for that Frank, unfortunately I think I may have to bite the bullet (or pellet as it happens) and put my model 75 up for sale.If anyone is interested it is left hand stock, left hand lever and the rear sight is the same as the lower image shown in the forum.
It is still pin accurate at 10m.
I will take the serial number of it this evening and also take some pics.
I also have an FWB300 for sale but this one is right handed and I attach images of that.