Help me id this glass liquor bottle with fingerprints
I found this bottle in an old miners camp.
--Federal law forbids sale or reuse of this bottle (1935-1964)
--Makers mark is a keystone symbol without anything in it
--Likely machine made
--Metal screw cap with two threads
--Fingergrips embossed on the side (right handed bottle)
--Bottom of the bottle looks like this: