It's a Guild F50 maple. I owned a Guild F-50R, with rosewood back and sides for many years.
If the action is currently too low, that's a very good thing. Typically the Guilds need neck sets because the saddle (in this case it's WAY too low) can't get any lower.
In this case you just need a new saddle, and Bob Colosi can absolutely make one for you, but you'd need to either give him the exact measurements of what is currently there, or send him the original to copy, except for the height.
All this assumes that the neck relief is properly set for the gauge of strings that your friend wants to use.
If you have a closeup of the back of the headstock with a serial number it's fairly easy to tell when the guitar was made.
Best regards,
Howard Emerson
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