C60 v C60 COSC

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lloyd_m
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Re: C60 v C60 COSC

Post by lloyd_m »

My non COSC C60 gains about 20 seconds a day. It's not that big a deal because I adjust the time the morning that I put it on, but if it were me I would go for the COSC version. My COSC C700 keeps nearly perfect time.
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Re: C60 v C60 COSC

Post by welshlad »

lloyd_m wrote:My COSC C700 keeps nearly perfect time.
COSC C700? :shock:
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Re: C60 v C60 COSC

Post by robinbarke »

lloyd_m wrote:My non COSC C60 gains about 20 seconds a day. It's not that big a deal because I adjust the time the morning that I put it on, but if it were me I would go for the COSC version. My COSC C700 keeps nearly perfect time.
Why not get it adjusted? It has the ability to operate in normal wear within 5 secs/day. Why settle for anything less?

That having been said my COSC C50 is outside the spec at minus 8 secs/day and so far I've resisted giving them the bother of adjustment. ( maybe a euphemism for "bone idle"!)

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lloyd_m
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Re: C60 v C60 COSC

Post by lloyd_m »

welshlad wrote: COSC C700? :shock:
Isn't it COSC? Oh well, it keeps really good time so I assumed that it was.
robinbarke wrote: Why not get it adjusted? It has the ability to operate in normal wear within 5 secs/day. Why settle for anything less?
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Re: C60 v C60 COSC

Post by Bahnstormer_vRS »

I know there is a C70 (DBR1) COSC but a C700? That's a new CWL watch on me.
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Re: C60 v C60 COSC

Post by scottg64 »

"The standard used by COSC is to test the accuracy of a mechanical wristwatch movement--before it is assembled into a watch--for consistent accuracy under a range of position and temperatures. COSC actually peforms seven tests as part of the certification. But the most commonly mentioned is the "mean daily rate" test for which a standard men's watch size mechanical movement, the watch must maintain an accuracy within -4 to +6 seconds of variation per day (that's +99.994% accuracy!)."

I have a C60 Trident Pro which I've owned for 18 months (which surprised me when I realised I'd had it so long as it still seems "fresh" to me!) and I'm pleased to report that it has settled to around +5 seconds a day

So I seem to have COSC accuracy for the price of a "regular" C60 - happy days :-) - but somehow I still manage to be late for work every day!
CW C60 Trident Pro, C9 Harrison Chronograph, TAG Link Chronograph, Longines Oposition Chronograph, Gucci 8900M (seemed like a good idea at the time!)
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