When i first saw this i thought i knew it from somewhere, it was something i saw a lot but could not remember where but figured it would only be a matter of time till i saw it again, well i saw it again but i was wrong..TREK bicycles.
Very similar but the 4 lines don't meet at the top, Trek has been around since the 70's so perhaps an old logo of theirs?
Even if it is not, it still looks familiar so will keep my eye open for it