Hi Bill
Thanks for the advice, it doesnt owe me a great deal, actualy swopped it with my father he doesnt like the modern bayonets, what price should i advertise at or even swop?

I'll leave the pricing up to you, the seller.

My friend, from the FN Belgium Cie, said to me that this model was not rare. FN makes this model since the 80s.
He did not find information about this bayonet FN, dating before 1980, because in this time that was not necessarily computerized.