The Staggs seem to be a generalized late '60's band - the fashion is kind of all over the place. But I see now why the author decided to make up a group rather than using an existing one!
I have seen a couple of Eastern bootlegs of various types at the local shop - I suspect most I see here in the Midwestern US came from US GI's that were in Vietnam or stationed in Japan in the '70's, based on the jackets. They tend to be rather poor quality printing compared to the official releases, and the sound quality also always suffers. In some cases, multiple releases were grouped together - somewhere the shop has a 'Golden Hits of 1973' box set that's got a good bit of Japanese copy on the sleeves for the 10 included albums.
The style of guitar she has is called a 'Franken-strat' in some circles - there are no shortage of those floating around today that have been built with both authentic Fender parts and others. From the headstocks, both guitarists for the Staggs use Gibsons - the blond uses a hollow-body of some sort (maybe an ES 335?), while the dark-haired one uses a Les Paul. The bass player has a Fender Precision. The reel-to-reel tape machine recording during their playing looks legit (though where are the microphones?), but I'm puzzled by the wise hermit playing the tape back in the car in this era - that must have set him back a few bucks.
Thanks for the chapter, and the notes!