It certainly resembles the Linhof styling.
My guess is that this is an early tripod connector to match modern Kardan monorail cameras.
The dovetail mount is 130mm long x 70mm wide and the overall height of the head is 68mm. The diameter of the round base is 90mm. It weighs 36 oz. or about 1 Kilogram.
Looks like the bottom rail clamp of a Linhof Kardan (GT?).
I knew it looked familiar, it IS the railclamp of a Kardan Master TL (should have known all along, because I got one ... will double check later tonight).
Thanks for the help!
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