Horological Meandering

flawless51
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Cyma Navystar Autorotor w/ in-house cal.480 movement

This is the latest addition to my collection, from the Cyma Navystar series, with their last generation of in-house mechanical movements from the 1950s. This watch is rare in that in comes in black and is all original. It was from someone who had a bunch of NOS Cymas from this era, and this one still had the sticker on the back.

The movement keeps perfect time for 20-30 minutes and then stops, so it will need to be serviced. I'll take a photo of it when I get home next week. It beats at a low 18,000 bph, has a very large balance wheel, Cyma's own unique winding system as well as their proprietary Cymaflex shock protection.

The case itself is very thin, round, and polished. The crown is signed pretty deeply, and the screw-in caseback is deeply engraved.

I really like this watch, and I think I would like to get a bracelet for it with rounded end links so it looks integrated; sort of Rolex Explorer style.

If anyone has more info on these Cymas and their movements, I'd love to hear it! I was interested in these when I heard something about Cyma submitting something to the chronometer competitions (no idea what or when), and how they specifically engineered these movements to fit the larger sized balance wheels. I don't know too much about Cyma's watches in general though.