For sale is a 1921 Martin 0-18K, a beautiful vintage koa-bodied Martin with the character, tone, and history you would expect from an instrument over 100 years old.

This guitar has been appraised at $10,000, but I am listing it with full disclosure that it does have age-related wear and some visible issues. That said, the guitar plays and functions properly and has a very warm, dry, vintage tone. It is a rare and highly collectible early Martin, especially desirable because of the koa construction and 1920s build era.

The guitar shows normal and expected wear for its age, including finish checking, scratches, dings, edge wear, and areas of finish wear on the top, sides, back, neck, and headstock. There are also visible lines/finish cracks around the neck heel and body joint area. Please review the photos closely, as they are part of the description.

It does have a end jack installed just straight to the saddle no electronics just plug in and get warm tone

The bridge, slotted headstock, tuners, and overall vintage Martin look give this guitar a very strong collector appeal. It has the kind of honest wear that shows it has been played, not just stored away.

Because of its age and condition, this guitar is being sold as-is, with no returns. I want the buyer to know exactly what they are getting: a rare 1921 Martin 0-18K with real vintage character, cosmetic wear, visible condition issues, and proper playability.

Condition Notes

• Appraised at $10,000
• 1921 Martin 0-18K
• Koa body construction
• Slotted headstock
• Pyramid-style bridge
• Plays and functions properly
• Visible finish wear, scratches, checking, and dings
• Wear around body edges and sides
• Visible lines/checking/cracks around neck heel/body joint area
• Endpin/output jack installed
• Sold as-is due to age and vintage condition

This is a rare opportunity to own a pre-war Martin koa guitar with over a century of history. The video linked in description is the same guitar but I had labeled it a 0-21K, it is the 0-18K as described here