Gruen Precision 17 Jewels, N510CA, ‚Day-Night‘

Beschriftung Zifferblatt / Marking Dial	Gruen Precision 17 Jewels
Uhrwerk / Caliber	N510CA
Modellname / Model Name	Day-Night
Baujahr / Year	1967
Anmerkungen / Remarks	Dial has cut outs at each hour marker which are black during day then jump to luminous markers at 6:00 pm evening and then back 6:00 am each morning .
Copyrights Photos	(C) Peter Schill, free for non commercial use