Special Opener Crowns

Over the years crown bottle cap manufacturers have experimented with a lot of different ways to make it easier for the consumer to open a bottle.
Hereby some examples of those types of crown caps.
The Lift-Top crown caps (bottom photo) were used from approximately 1964 to 1969.

With a special thanks to Gunther, Vladt, Massimo Gadola (CCSI #153), Jon Bailey (CCSI #710) and A. Noah Harrison (CCSI #481) for providing the images.