Re: Vintage Guitar Research
Pam,
Looks like an instrument worthy of saving. If the neck is not warped and frets properly dressed the 'action' can always be improved upon at the nut & the saddle (bridge).
Most of these acoustic instruments had mahogany necks and various makers, including Martin, used a square tubular non-adjustable truss rod to stiffen up the neck and resist the bowing from string tension. As I don't see any access to a truss rod on the headstock and you say you only see a wood block at the attachment point through the sound hole, I suspect this instrument is not adjustable - as you suspected.
The bridge can be re-glued (hot hide glue strongly recommended) after the wood surfaces are properly cleaned.
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