One of Frank Sinatra's toupees is about to be sold at auction -- and the current proprietor of Ol' Blue Eyes' hairpiece is in TMZ's very own newsroom ... someone who tried keeping the whole thing under wraps.

See also

Sinatra Jr.'s Son Hospitalized After 'Suicide Attempt'

Sinatra and Columbo: We've Got Pens But No Pals

Nancy Sinatra Got Dumps Like a Truck

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