You have a pair of very old MK1's.
Lee, I am only forwarding info I was told by B&O. The dealers class it as MK4 as it is a different mould that B&O had used to make the lastest version. Thats all.
So why change the MK's? So why call your old one's a MK1? Or why call a MK2 a MK2 and a MK3 a MK3? B&O do this I think.
Anyway... never mind! Have great Xmas Lee!