Hello, and please tell me about my watch!

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That's the sort of thing I was expecting to see, honestly.

Out of interest, why would you not advance it slightly so that it gains, rather than loses?

I have returned the watch and told the seller that I might buy it back if they can demonstrate that it's been attended to properly.

I’ll let it run for a day or so, on the wrist. Timing machines are useful in the repair of a watch, in terms of ironing out watch conditions that cause significant variations in rate. But I feel that final adjusting is best done after actually wearing the watch. This one has gained 3 seconds after 12 hours on the wrist. Even though the timing machine shows a slight loss in all six positions. This watch is not rated as a chronometer, and probably was only timed to three positions at the factory. So testing it to six positions as I did, is sort of an acid test! Besides, this watch (and yours) don’t have micrometer regulators, and adjusting these standard non-micrometer regulators for seconds per day is a crap shoot. If you can see how much you’ve moved it, you’ve moved it too far. This exercise (with my watch) is useful to point out either that yours has problems that have not been attended to during the servicing it was supposed to have had, or it simply was NOT serviced!

I’ve shown two images. One shows a standard regulator (yours and mine), and the one with the arrow shows a micrometer regulator which is better when adjusting for seconds in a day.

 
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I’ll let it run for a day or so, on the wrist. Timing machines are useful in the repair of a watch, in terms of ironing out watch conditions that cause significant variations in rate. But I feel that final adjusting is best done after actually wearing the watch. This one has gained 3 seconds after 12 hours on the wrist. Even though the timing machine shows a slight loss in all six positions. This watch is not rated as a chronometer, and probably was only timed to three positions at the factory. So testing it to six positions as I did, is sort of an acid test! Besides, this watch (and yours) don’t have micrometer regulators, and adjusting these standard non-micrometer regulators for seconds per day is a crap shoot. If you can see how much you’ve moved it, you’ve moved it too far. This exercise (with my watch) is useful to point out either that yours has problems that have not been attended to during the servicing it was supposed to have had, or it simply was NOT serviced!

I’ve shown two images. One shows a standard regulator (yours and mine), and the one with the arrow shows a micrometer regulator which is better when adjusting for seconds in a day.


Still 3 seconds fast after a 20-hour run!
 
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Not as pretty as your 18-karat gold confection, but unarguably, a much better performer!
 
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I changed this one from my right wrist to my left four hours ago, and it has dropped the three seconds it had gained after 20 hours. It is now 24 hours since the test started, and it is dead on. Change wrists, and continue rating it.
 
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End of test. When I last checked the 283 yesterday, after a 48-hour run, it was still within 3 seconds. Got up this morning and found I had forgotten to wind it yesterday. But as far as the time test went, it indicates that a calibre 283 that hasn’t been previously butchered, once thoroughly serviced and adjusted, can be made to keep much better time than to original subject watch in this thread.
 
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End of test. When I last checked the 283 yesterday, after a 48-hour run, it was still within 3 seconds. Got up this morning and found I had forgotten to wind it yesterday. But as far as the time test went, it indicates that a calibre 283 that hasn’t been previously butchered, once thoroughly serviced and adjusted, can be made to keep much better time than to original subject watch in this thread.

Indeed it does.

Now I need to find a replacement. I’ve just tried on a Patek 5196 and I am not sure that it wowed me enough to buy it.
 
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Indeed it does.

Now I need to find a replacement. I’ve just tried on a Patek 5196 and I am not sure that it wowed me enough to buy it.

Back to square one! How about this nice-looking 14k Longines, available on this forum? Or this 10k Hamilton? A more modern gold capped Seamaster? I'm not affiliated with any of the sellers.

I'm still wanting a gold Constellation Grand Luxe with the stepped dial, myself.
 
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Dennison did not follow the Omega convention with their case numbers. Indeed the 13302 was as I recall seen with movements from other manufacturers too. They were not exclusively an Omega case maker. I have seen chronometer rated Dennison cased watches but I am willing to bet this isn’t one of them.

ps the hallmark on the OP watch was for 1952-53, not the 1950 stated in post 1.
Edited:
 
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End of test. When I last checked the 283 yesterday, after a 48-hour run, it was still within 3 seconds. Got up this morning and found I had forgotten to wind it yesterday. But as far as the time test went, it indicates that a calibre 283 that hasn’t been previously butchered, once thoroughly serviced and adjusted, can be made to keep much better time than to original subject watch in this thread.

i have decided for my own interest, to give this 283 a further test, just to see what it can do. I haven’t touched the regulator since I first started to test it several days ago. I have reset it to the second again, just now, wearing it on my right wrist, and I’ll try to remember to wind it this test.
 
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By way of a conclusion to this thread.

I returned the watch to the dealer and have had a full refund. I said to them "if you decide to have the watch serviced properly I will buy it back from you".

"We'll be happy to do that Vizard"

They haven't been in touch and I notice that the watch is back on their website and Chrono 24, still with the same description, still claiming that it is running perfectly and "arrow straight -10 per day".

I guess most of their buyers don't care, so long as the watch looks good and the hands go round and round.