Gruen Watch Co. was a prominent American watch company founded in 1894 in Cincinnati, Ohio by German-born Dietrich Grün (anglicised to Gruen). Movements were designed by Gruen and manufactured by partner firms in Switzerland (and from 1903 at its own Swiss subsidiary in Biel/Bienne, Aegler/Aegler Watch Co.), then adjusted, dialled, and cased in Cincinnati. Many Gruen calibres were based on FHF ébauches, as the archive designations confirm (e.g., Gruen 100 (FHF Robert 8.75")). The firm consolidated all entities in 1922 as The Gruen Watch Company.

The standout collector piece is the Curvex (1935) — the first men's curved wristwatch with a movement engineered to follow the case profile, a genuinely novel mechanical achievement. Gruen also produced the Precision series of high-grade movements. The company relocated to New York in 1958, after which meaningful watch production ceased. Vintage Curvex models are actively sought by American watch collectors; more common models are affordable entry-level vintage pieces.

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Manufacturer Movement
Gruen Manual 19.8 mm
Gruen Manual 27.07 mm
Gruen Manual 19.8 mm
Gruen Manual 18.1 mm
Gruen Manual 12.85 mm x 19.7 mm
Gruen Manual 12.85 mm x 19.7 mm
Gruen Manual 12.85 mm x 19.7 mm
Gruen Manual 12.85 mm x 19.7 mm
Gruen Manual 21.99 mm
Gruen Manual 21.99 mm
Gruen Manual 19.74 mm x 27.07 mm
Gruen Manual 19.74 mm x 27.07 mm
Gruen Manual 19.74 mm x 27.07 mm
Gruen Automatic 29.8 mm
Gruen Manual 19.74 mm x 28.2 mm
Gruen Manual 22 mm
Gruen Manual 15.35 mm x 17.5 mm
Gruen Manual 15.35 mm x 17.5 mm
Gruen Manual 15.35 mm x 17.5 mm
Gruen Manual 15.35 mm x 17.5 mm
Gruen Manual 15.35 mm x 17.5 mm
Gruen Manual 15.35 mm x 17.5 mm
Gruen Manual 15.35 mm x 17.5 mm
Gruen Manual 15.35 mm x 17.5 mm
Gruen Manual 15.35 mm x 17.5 mm
Gruen Manual 15.35 mm x 17.5 mm
Gruen Manual 15.3 mm x 18.2 mm
Gruen Manual 15.35 mm x 18.2 mm
Gruen Manual 15.35 mm x 18.2 mm
Gruen Manual 15.35 mm x 18.2 mm