Gold ring with black stone & question mark

This was a gift from Frank Lane (Frank Caldwell, magician and family friend) to John Davenport, probably in the late 1960s or 1970s. Frank used to wear it and John recalls that Frank told him he used it as a sign for gaining entry at a speak easy. He would show it at a grill in the door. John recalls that Frank said someone else had a similar ring – could it have been Ted Annemann? This recollection is at least partly right because Gabe Fajuri has pointed out a photograph of Annemann wearing a similar ring. This photograph can be found on the copyright page of Max Abrams’ book The Life and Times of a Legend published by L & L Publishing.