Girlfriend recently, 3 months ago, gifted me with a 3 guitars and a banjo from an estate sale. 3 questions. 1st guitar is as best as I can figure is a 1978 Gibson Les Paul custom, no case. Any quick way to tell if it's authentic. Everything but the strap locks seems authentic but even they look old. Wear on top of neck. Smells seems age appropriate with no cigarette smoke. 2) BC Rich Avenger. Best sounding gtr that I now own. Seems mid linish quality wise but rhythm sounds dirty and clean excellent. 1 tone knob, bc rich brand bridge hunbucker only. Are all of these gtrs sold new for under $1000? Again not sure if authentic. Looks to be though.3rd is what seems to be a 1979 ovation celebrity. Didn't know celebrity was that old. Big bowl. Sounds pretty good. Has what seemed to be major cracks on top but using camera on phone and my fingers inside, (can only imagine the joke I could come up with on that one) they (2) only go through clear coat on top but not wood. Are celebrities that old?