Pot codes:
Take off the back cover for the volume and tone controls. In the late 60s and early 70s the manufacturer of the pots stamped a code on there (they may still do it).
It's a 7 digit #.
The first 3 #s indicate the manufacturer. In many cases it's 137
The next two digits are the year the pots were made.
The last two digits are the week of the year.
As in the linked thread, 1377323 would indicate that the pots were made in the 23rd week of 1973.
http://www.lespaulforum.com/forum/showt … =pot+codes
If you care to register over at the Les Paul forum, I'm sure you can get some very useful info.
also try LSLP.com for a lot of info on the late 60s Les Pauls.
I'd also recommend checking out this site. It has a lot of info about vintage Gibsons.
http://www.provide.net/~cfh/gibson.html
The fact your serial number begins with 0 is very interesting. LP Customs were re-introduced in 1968, after some 0s were used. Based on the above, 0s were used in 1973, but you'd also have the Made In USA stamp with it.
I'd definitely check this out. If you have an early re-issue Custom (e.g. 68) or (gasp) something from earlier, then that guitar could be worth a lot of money.
Keep us informed.