This pic made me realize a detail about the T-40 fretboard/neck:
On my 1978 PAF there is about 1/4" of fretboard beyond the Al nut, before the headstock dip. I haven't seen that documented anywhere, so thought I'd mention it.
yep:
The line all the way around the trussrod cover is a giveaway to being one of the earliest models as well.