Ok, I took a day off today so I can spend some time with this & crank it up some. I've been playing at night using a Vox Amplug (classic rock) into my Champ type amp, but its not the same as, well, really moving some air with a decent amp.
Firstly, a couple of pics etc. It does have a small ding & couple of scratches on the back (buckle rash) & a couple of small marks on the front, but over-all, for (a few weeks over) 37 years old its really quite good. Serial No. shows it as having the headstock stamped on 11th June, 1981 in the Nashville plant. It has the extra four digits stamped below the Made In USA signifying it as a Heritage Series 80, along with the truss rod cover. A (hopefully) better pic of the top, sorry about the light reflection I was trying to avoid
Has the period type "ashtray" cavity shield

the very end of the can type output jack shield can be seen, also the can type switch cavity shield & foil backed cover
Has the ABR-1 type bridge
Side view of bridge with tailpiece decked & all strings clearing back of the bridge
Neck angle is good, the low, wide frets of the period in good condition. Action is nice & low with bugger all neck relief, which is good, I like the neck nice & flat. Beatifully playing guitar. I've read of people not liking these frets, saying they have trouble bending with them, but I tried all manner of bends & I'm liking them. Weight wise its a little heavier than my traditional, but not overly heavy, I'm guessing in the 9.4 - 9.5lb range. Controls are wired "modern" style (which will probably be changed).
With the 10~46 gauge strings it came with & plugged through my little champ, amp volume 4, guitar volumes 8 & bridge tone rolled back a little it has a beautifully rich, warm tone, not as aggressive as my traditional but more complex. The non stock neck pickup (which I yet have to ascertain what it is) is very powerful, even though set very low. It also has a nice rich, sweet tone. No mud at all. Its a little brighter than my traditional 's neck pickup (BB1 with A5 magnet swap). The middle position also is impressively nice but I don't really like the way the modern controls react. With the amp volume up 'round 9 (goes to 12), where both amp & alnico speaker are breaking up & compressing well, & with the guitar volumes dimed it delivers some really nice rich dirt tones. The bridge shawbucker can push the amp plenty hard enough & responds really well to picking dynamics. The neck pickup, whatever it is gives a great lead tone, rich & clear & also responds well to touch. Over-all I'm really impressed with how the guitar plays & sounds. So, I'm off to try it through my 4 hole 50 watter. I'll restring it over the weekend, which should make a difference. Cheers