The first thing I would check is the tuners. One little screw coming loose can cause a buzz.
It can be hard to tell if a brace is loose by feel. Just because it doesn't wiggle doesn't guarantee it's not loose. If you run your fingernail along the top of the braces (if you can reach all of them) you should be able to tell if there's a gap.
If you can get the end pin out you can peek through the hole while running a flashlight along the braces to see if there's any light coming through where it shouldn't be.
It could be a back brace too.
Those old mahogany Martins are something special. I hope to own one someday.
Best of luck to you
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“Good grief”
-Charlie “Chuck” Brown
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