Conversation so far:
Who did Bruno Sammartino defeat to gain his Second World Heavyweight Championship?
Bruno Sammartino regained the WWWF Heavyweight Championship by defeating Stan Stasiak on December 10, 1973
Did Stasiak try to regain his title during Sammartino's Second World Heavyweight Championship reign after Sammartino regained the WWWF Heavyweight Championship by defeating him?
What was Bruno Sammartino's best match during his Second World Heavyweight Championship reign?
Bruno Sammartino returned and faced Hansen in a rematch on June 25, 1976 at Shea Stadium. The match was rated 1976 Match of the Year by Pro Wrestling Illustrated.
Was Bruno Sammartino in any PPV specials?
Bruno Sammartino was featured in PPV specials

Question: Did he ever lose the title during this period?
Self-contained rewrite: Did Bruno Sammartino ever lose the title during his Second World Heavyweight Championship reign?