Quote:
Originally Posted by Foughe
...As a maker of Martin style guitar (or outright copies) I was just wonderin' why they didn't choose for the standard 4" diameter.
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There were no true "copies" of Martin guitars during that period. Look inside and you'll find all sorts of things that aren't exact copies of Martin construction. The sound hole diameter is easily measured, so it's obvious. It could as simple as whatever tooling they had available was used and that produced a slightly smaller hole.