Gruen 21 Precision Tank Watch, Black Dial with Sub-Second
Gruen · Jewelry & Watches > Wristwatches
Era / Decade
Early 1950s (based on the '21' model series and Art Deco styling cues)
Material
10k or 14k Gold Filled case; acrylic crystal; mechanical hand-wind movement
Condition
Fair to Good. The crystal is heavily scratched/crazed; the case shows 'brassing' (wear through the gold plating) on the lugs; dial shows age-appropriate patina; watch band is missing.
Demand Level
Moderate to Strong. Vintage Gruen collectors are active, especially for 'Precision' models with black dials.
Resale Value
Estimated Resale Value
$75.00 - $150.00 (Untested/As-is) to $250.00+ (Serviced/Working)
Estimated Retail Value
$65.00 - $85.00 (original 1950s price adjustment for inflation would be several hundred dollars today)
Comparable Sales
Recent eBay sales for similar Gruen Precision tank watches range from $80 for parts-only condition to $325 for fully restored examples with original bands.
Description
Vintage Gruen 21 Precision mechanical men's tank watch. Features a rare black dial with gold-tone dot and dagger indices, a square sub-second dial at 6 o'clock, and a rectangular gold-filled case. This is a classic example of American mid-century horology.
Key Features
Highly desirable black dial; 'Precision' 21-jewel movement; Art Deco 'Tank' styling; collectible American heritage brand.
Authenticity Indicators
Dial logo matches 1950s Gruen typography; movement should be stamped 'Gruen Watch Co' with 21 jewels; case back typically signed. Confidence: High.
Flaws to Note
Scratched and clouded crystal (needs replacement); significant gold wear-through on the lugs; missing strap; unknown working condition; crown may be original but shows wear.
Selling Guide
Where to Sell
eBay or Chrono24. eBay is best for reaching the widest audience of vintage watch collectors and 'refurb' hobbyists.
Selling Tips
Do not attempt to polish the dial. Mention if the watch 'ticks' when wound. Use keywords like 'Tank Watch', 'Art Deco', '1950s', and 'Black Dial'. Photography should include a clear shot of the movement if the case back can be safely opened.