GRUEN PRECISION
DAY-NITE, Circa 1960s
Chromeplated Case with Stainless Steel Back.
Silver Original Dial. 17 Jewel Manual Wind. Cal. 510ca RSS.
Silver 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. 34mm Case.