Seiko 8F56-00F0 Used Perpetual Calendar Quartz Mens Watch Authentic Working - Japan Pre-owned Vintage
8F56-0050] 1998 Perpetual Calendar -- bezel not rotating, battery needs replacement, needs overhaul in general -- but hey it's an interesting piece (and still works)! : r/Seiko
seiko 8f56-0040 石英錶萬用鈦綠色錶盤| PChomeUSA 海外代購
Seiko SBQJ015 perpetual calendar with 8F56 movement (READ DESCRIPTION) - YouTube