Guys, just picked up the Gibson Les Paul Deluxe. Was described as a 1978 model, however, serial number comes back as a 1977(serial stamped into back of headstock). I know Gibson made a model called the "Pro Deluxe" that had the P90s, maple neck and top(like this does)starting in 1978. Can I assume that they used a leftover neck from 1977, or is there another explanation? I have seen other Pro Deluxe models, but they say "Pro" instead of "Deluxe" on the truss rod cover. The guitar appears all original with no extra holes or funny business. Any help would be appreciated. It is a great guitar, that's one thing I'm sure of!