Design classics - bottle openers by Futagami based in Takaoka Japan.
"Frame" is a simple bottle opener, where the hairline on the outside and the finish on the inside is the finish of the casting.
"Crescent moon" and "Eclipse" are forms that at first do not appear to be bottle openers, but are surprisingly easy to use . Can be attached to the bottle.
Eclipse (shown bottom right)
Crescent (shown bottom left)
Frame (shown at top)