My M1910 Mannlicher Schoenauer has see through claw mounts.

They are excellent for 'snap shooting' as, with the scope mounted, one has the instant option of using the scope (longer shots at slow or stationary targets) or open sights for small, fast things. The 'cheek meld' of the pre WW2 MS stock offers an instant sight picture through the iron sights when the rifle is brought to battery.

I find see through mounts awful to use. The thing with open sights is you have that unobstructed field of view that lets you see the big picture as well as the sights. Looking through the mounts takes that away and I find the scope and mounts very distracting when trying to snap shoot. If the scope is there I instinctively look through it no matter how high or low it is. Much prefer to use the claw mounts and just take it off. Actually prefer no mounts at all.