Offset MC adapter

Jet said

Is this the correct adapter for a BO29?
I bought it from Dave Koffel at a swap meet in Detroit almost 40yrs ago.

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I guess you could say correct adapter in terms of function correct, but the correct adapter for a BO29, not in terms of looking correct...
Dave Koffel... I´d frame it... What if it is the prototype for these offset adapters?