This is the Ten Pin Pilsner Glass that was used by Trader Vic's for the "Potted Parrot", "Shingle Stain" and other drinks. Obviously it gets its name from the fact that it is shaped like an upside-down bowling pin. It was also used by other establishments including The Kahiki Supper Club (for their "Bahia"). Can be found in Trader Vic's Bartender's Guide Revised Edition (1972). The black footed versions were older, and The Kahiki could only source clear ones in the mid to late 70s. The Imperial Glass catalogue number for these is #846 and also pictures a covered snack container shaped like a black bowling ball to accompany them (#857)