Dear All
Below are some additional photos about the earlier-type and now apparently uncommon MS scope mounts (without central pin) filmed by Wurger in the excellent video about his MS 1952. My MS 1903 is equipped with similar scope mounts and I must reckon they are great to use.
Best regards.
Louis

Scope base - front

Scope ring - front

Scope base - rear

Scope ring - rear

Mounted scope