I don't think Guild used any Adirondack spruce until the move to Tacoma. I've got a '76... great guitar!
Just for the sake of corroborration that'd be my take on it too. We've had some threads recently discussing the question and the well-informed input was that Adirondack spruce was a very scarce and uncommon topwood at the time, in fact, virtually unavailable.
We haven't found concrete evidence Guild ever used it in the '60's, but there's a lot of circumstantial evidence as to why they wouldn't have.
It didn't see a resurgence in popularity until the "boutique" makers started coming on the scene in the '90's.
With Brazilian rosewood the issue was Brazil clamping down on export of the wood in the late '60's. Martin stopped using it in '69, anything after that from anybody would have been made using old stockpiled wood, and that would be more likely to be used in the highest-end instruments like D55's or the occasional D50 as Gardman mentions.
It's also been mentioned that simple visual analysis isn't a highly reliable method of identifying whether a sample is EIR or "Braz", but Braz does have a reputation of being more highly "figured" that EIR. If the grain patterns are fairly tight and close without a lot of "waviness", that would tend to indicate EIR , if they're pretty wavy and spectacular it would tend to indicate "braz". Also braz can have a spectrum of colors ranging from bright red to almost black grain, EIR less likely to show that dark of a grain pattern.
Also braz is supposed to have a sweet smell but not sure if that'd still be detectable after 50 years.
In counterpoint, ain't nuthin' "wrong" with EIR and sitka,
the way Guild makes 'em.
:wink:
Oh... and "Welcome to LTG!"
Yeah! What he said!
:smile: