Mitchel Field

The Mitchel Field is automatic. The Seiko NH36A winds itself from the motion of your wrist, so it needs no battery. A full wind holds roughly 41 hours, so it keeps running overnight off the wrist; left longer it stops and restarts once you wear or hand-wind it.

The Mitchel Field is powered by the Seiko NH36A from Seiko Instruments, an automatic caliber with 24 jewels, a 41-hour power reserve, and a 21,600 bph beat rate. Being automatic, it winds from the motion of your wrist and needs no battery.

Yes — the Mitchel Field has a date display on the dial. The date advances automatically as the movement runs, so the current day of the month is always visible at a glance, and you can set it from the crown after the watch has been left to stop.

The Mitchel Field is rated to 100 m. That covers swimming and snorkelling, though hot water and direct high-pressure water are best avoided, and it is not intended for scuba diving. Whatever the rating, avoid operating the crown or pushers underwater, and have the gaskets checked periodically to keep it reliable.

At 39 mm across with a 48.5 mm lug-to-lug and 12 mm thick, the Mitchel Field wears as a versatile mid-size watch. Lug-to-lug is the measurement that really decides fit, since it sets how far the case spans the wrist — 48.5 mm suits most wrists, and smaller wrists especially should check that figure.

Long Island Watch lists the ISL-41 with an NH36A automatic movement with hand winding, hacking, and about 41 hours of power reserve.

The ISL-41 is listed at 100m water resistance via a signed screw-down crown.

The official product page lists a black woven nylon strap with leather backing and quick-release pins.