There were a lot of cross-over and re-branded watches that popped up over the years, but for the tech geeks this one may hold a special place:

Universal Genève Unisonic watches using Bulova’s Accutron tuning fork movement technology to produce a Swiss-made chronometer (in this case, a diving chronometer!).

But don’t just take it from me; here’s what UG said in 1970 about it…

UNISONIC: world’s first All-Swiss deep diving and day-date tuning fork watches.

Unisonic’s incredibly tiny tuning fork—thenew “life force” of time—splits a second into 360 equal parts. It is practically indestructible. Not so with the old balance wheel it replaces. Unisonic hums. Conventional watches tick. “Vibrations from the Swiss” exclusively Universal!

Retailing in 1970 for $225 (or about $1,500 today), these tuning fork watches, like their American counterparts, were a scientific break-through in timekeeping—the most accurate watch in the world at the time.

This UG model has a beautiful coin-edge fluted bezel and that beefy screw-down diver crown. With a minimalist design and a smooth crafted stainless steel case, this example is about as good as you’ll find for this reference…that is, if you can find another one.

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Case: Nice stainless steel in great shape. Not perfect, but brushing is still very intact and presents very well. Caseback shows wear and opening marks, although no cause for worry.

Dial: Excellent shape! Lovely white metallic color.

Hands: Great shape with original lume that has aged to a light, buttery yellow.

Movement: Nice running movement keeping good time.