Let the dog see the rabbit chaps...... It started its life as a Mk1 and someone in the past has chopped off the anti-rotation block AND the underside of the locking segment collar rings in order to make it fit his mickey mouse mount and sit low onto the rifle.

Looks like the turrets have been 'streamlined' by rounding them off. It might be that the same cack-handed clown put his finger through the grat post and cross wire while he had it apart. So he's replaced the grat and post with a bit of fuze wire(?). And now, he's hoping to make a killing at the expense of someone.

To be honest, I've seen much worse and that one is a simple fix to return to standard spec. New index plates, turret head thumb screws and grat.