I was wondering if I'm able to place a date on my copy of U2-Three (7"). For years I've believed it to be an original 1978 version, but I could be wrong. What identifying features can I check for? I'm assuming it'd be on the label, or written on the vinyl surrounding the label itself.
I've seen maybe one Three before in a store, but even then that could well have been a copy - I didn't bother asking because it didn't look too much. I wasn't too informed to know at that time - but they're getting harder to come across as you probably know.