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GRUEN PRECISION DAY-NITE, Circa 1960s


Goldplated Case with Stainless Steel Back. White Refinished Dial. 17 Jewel Manual Wind. Cal. 510ca RSS. Yellow Luminous Hands.
Cutouts to Show Black Markers from 6:00 AM to 6:00 PM; Green Luminous Markers from 6:00 PM to 6:00 AM.
 Original Unsigned Crown. Plastic Crystal. 33mm Case.
Completely Serviced by Mr. David Hornstein in January, 2006.
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Photographed by Cary Hurt.