This has more the feeling to me of a museum tag that was given to visitors as part of a conceptual art piece than made to be worn by volunteers, but who knows? (I've searched but can't find another out there that matches it.) Whatever the case, I like the idea that to wear it now would require one to assume the responsibility of being helpful in one way or another. And just the best white lettering against this sunny yellow. I seem to be finding art in many places these days, but something about the succinctness and perfect design of this one makes me want to put it in a frame, hang it on the wall, look at it many times a day, and try to live true to it.
1" in diameter, 1 5/8" long including tab. Good vintage condition, wonderfully bright yellow (shot with magnification here which shows every tiny bit of surface wear) with the tab never bent it appears.