ok, first things come in
igorrock send me a pm:
"Hello again

I think these mounts are H&H:s own model:

http://www.targetsportsmagazine.com/features/view/10331/sniping-remarks-snipers-eyes/

Holland & Holland mounts

Holland & Holland also used a side mounted set-up, but the front mount hooks into a slot and around a transverse pin (the block housing the pin is again sweated on to the barrel). The rear mount fixed to the side of the receiver uses a mortised slot with a rollover latch. The rear ring mount on the scope incorporates a dovetailed slide and a projecting hook. Engaging the front scope ring hook first before pushing the scope down into the rear mount is the method of fitting the Holland & Holland Aldis. You can achieve windage adjustment by moving the dovetailed slide in its slot by opposing flush screws each side of the slot. These screws are pushing screws. Tighten the right hand screw and it will push the scope ring to the left. Tighten one of these screws on the same side as the error if the rifle is shooting off. One complete turn is about 20" at 100 yd.

Nowadays PRECHTL makes model which looks quite same."