What kind of coin are you willling to drop and what part of the world are you from ?? I'd say there is a MIJ Custom for every budget. Of course specs command price especiallly new. Vintage is a whole different game.
I dont myself but if you have enough experience to do a good setup for him I'd say go with him to check it out to see if it's more trouble than it's worth. If the frets are pooched or it has a twisted neck etc. It ain't worth a damn.
The serial says its from January of '79.
It looks in great shape from the pics. I see a multipiece maple ? neck so i would think it would be a pancake body construction style. People with more knowledge of these years will know for sure.
If i don't win and get my refund i lose about $20. Of course everyone takes a piece, Paypal, Visa, my bank.... I'm in Canada though, there is a service charge for almost everything. I've even been stupid enough to do it more than once lol.