this is pretty much what rock postering looked like in the 70's. at least in seattle, where this is from. it's done as a silkscreen cardboard showcard style by an outfit called zeppelin studios.
- (at least i assume. it could have been done - if it's early enough - by an actual showcard company that did rodeo posters and such called the 'washington poster company'. they were an actual old showcard company like hatch and actually did a hendrix and a joplin poster that are highly collectible).
zeppelin studios were a bunch of hippies turned professional designers and were the shit in the 70's in seattle. they did some really great work - and some really bad work, too, as they got old and bored. by the end of the 70's they were a signpainting company and pretty much quit on the poster stuff.
this poster looks like prime zeppelin studios work to me, though.
thank god punk came a long and fucked everything up. imagine a world where this was the height of cool..