It's 1954, all the Customs had P-90's and they were all mahogany, no maple caps. Humbuckers didn't come out till 1957.
Dude! Love that color. I have seen Rhoads' Les Paul in person in 2002 and that color is so close. I like white, but I don't "love" the bright white...I like the aged look.
Interesting thing is, that is not very aged at all. Mine was almost that identical color when brand new - it wasn't white, they called it "blonde" and you could easily tell that it was painted that custard color at the factory because it looked exactly the same inside the cavities and the binding was pure white. I've noticed over the years that most people that list these for sale don't know this because they say something like "beautifully aged Alpine White" or some such thing in the ad. I remember quite vividly what the color was when I got it...hell, I still remember the serial number from that guitar (72497511).
September 6th, 1977 production date based on the serial number you posted...
The only reason I am not looking at white is because I like that "custard" color and all I can find is that brilliant white....
It's funny I still remember the S/N, but I had that guitar for 22 years before I sold it so maybe it does make sense. Truth was, it got messed up in a refret and I couldn't afford to keep a guitar that I couldn't use to gig with so I let it go. I wish I still had it for sentimental reasons and if I still did I would spend the money to get the fretboard sorted out.
There have been a few reissues and custom runs in that color but yeah, for the most part you are looking at a Norlin-era guitar, so '70's - early '80's.
Daydreaming...
The one thing I "see" happening to this LPC, if indeed I am blessed enough to get it, is a knob change. The black speed knobs are virtually invisible. I'm thinking amber bells or gold inlay witch hats...