To the best of my understanding, the Hiscox 000/OM cases fit 12-fret models: https://umgf.com/000-12-hiscox-case-fit-t197061.html
Maybe do a bit of digging on that.
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"What have I learned but the proper use for several tools" -Gary Snyder
Bourgeois DR-A / Bowerman "Working Man's" OM / Martin Custom D-18 (adi & flame) / Martin OM-21 / Northwood M70 MJ / 1970s Sigma DR-7 / Eastman E6D / Flatiron Signature A5 / Silverangel Econo A
(Call me Dan)
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