According to Jules' site all the sixties Thunderbirds had the non-laminated neck.http://www.flyguitars.com/gibson/bass/Thunderbird_1963.php
Do the shipping records show the serial numbers of those two? If not, there wouldn't be a definite way to tell them apart from the others, considering the unreliability of Gibson numbers back then.
I'm sure the shipping ledger has the serial numbers listed, but I've never seen that actual page, or even know if it still exists. Didn't Gruhn or someone else get ahold of most all the old Gibson ledgers?
I have a '63 Firebird with the original two-piece neck.Were the two '63 Thunderbirds supposedly also like those or one-piece necks?
I have a '63 Firebird with the original two-piece neck.