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It looks like Kwillmorth gets the prize. The 3066 has an offset azimuth clamp, most newer Manfrottto's that I've see have it centered on the azimuth axis, so I'm pretty sure the part is of that vintage.Looks like a base/spindle for the Bogen 3066 for the video head, without the head itself.
R116,36 TripodBase and Spindle| BogenTripodParts.com