Seiko

Rotor turns not to power mainspring but to power rechargeable battery. I believe it pre-dates Seiko’s spring drive. Thoughtful gift from a mentor/friend. ...  

Indeed a lovely present from a mentor/friend. What are the specs?

stainless steel, 42mm wide, 22mm lug to lug. Complications: 24-hr register, month and leap-year indications. With battery run down, continues to keep time but skips and moves every two seconds. Only way to recharge is to wear it or put it on watch-winder