from the online museum -

RARE Western Electric 750A Loud-Speaking Telephone - eBay (item 290397417503 end time Feb-06-10 18:22:41 PST)

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He also has a pair of Altec 287 field coil CDs in 'other items'.

Which went for just over 10 grand, combined with these and the other RCA units, almost 20 grand. If only we could all find such treasures behind old cinema screens...