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[Linked Image from thumbs2.imgbox.com]

Interesting feet & bases where the rotation of the lever(encircled in blue) mates with the semicircle(encircled in orange) to the bases. It looks to be a Krieghoff style mount. I do not believe the feet & bases have been divorced since before WWII. The scope & feet slide forward and the only way I could convince them to move was with a wooden dowel. Just tap a wooden dowel with a hammer centred on the rear foot and the whole lot moves towards the muzzle.

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And the reverse install will require that the semi circle be directly in the semicircle divot

Hochachtungsvoll,

Raimey
rse