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1975 C.F. Martin & Co. OM-28

A mid-1970s special-order OM-28 — Indian rosewood, 000 body, long scale. Growing interest in the OM format among discerning fingerstyle players was building toward the eventual 1990 reintroduction.

Current Market Value

Excellent
$5,000–$10,000
Very Good
$3,200–$5,000
Good
$2,000–$3,200
Fair
$1,000–$2,000

* Prices are estimates based on recent market data. Actual value depends on originality, condition, and provenance. Pricing methodology

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Specifications

Body WoodSpruce (top), Indian Rosewood (back and sides)
Neck WoodMahogany
FingerboardEbony
Scale Length25.400"
Frets20
Pickup ConfigNone (acoustic)
BridgeEbony belly bridge
TunersGrover Sta-Tite
Finish OptionsNatural
Est. Production40

Pickups & Electronics

Pure acoustic fingerstyle guitar.

What Changed in 1975

Special-order OM-28 continuing sporadic production. Indian rosewood. Interest in the OM format was growing among fingerstyle players who recognized its unique qualities.

Collector's Notes

1970s OM-28s are uncommon but not the investment pieces that original 1929-1933 examples are. Good player instruments for those who want the OM format in a vintage Martin.

How to Authenticate a 1975 C.F. Martin & Co. OM-28

Martin serial numbers are the most reliable in the industry — verify the number stamped on the neck block (visible through the soundhole) against Martin's published tables. For 1975, the number should fall within the documented range. Indian rosewood back and sides — verify correct grain and coloring. Non-scalloped X-bracing pattern for this era — verify through the soundhole. Orchestra Model — verify 25.4-inch scale length (longer than the similar-looking 000-28). Check for neck resets, top cracks (especially near soundhole and bridge), and bridge plate condition. Tuners should be Grover Sta-Tite. Finish should be nitrocellulose lacquer with age-appropriate wear. Original case adds value.