Which Omega is this?

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When the watch is not sufficiently 'charged' would it then first run slower before it stops altogether? I ask this because I noticed a 5-minute time loss after about half a day.
 
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When the watch is not sufficiently 'charged' would it then first run slower before it stops altogether? I ask this because I noticed a 5-minute time loss after about half a day.

When was it last serviced?

You have the equivalent, in car terms, to a 1960s Mustang. Cars will run like crap and wear parts out unless they are maintained.
 
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I don't know. My father can't tell me anymore ;-)
But would the behaviour I described be standard behaviour for a well-maintained watch?
 
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I don't know. My father can't tell me anymore ;-)
But would the behaviour I described be standard behaviour for a well-maintained watch?
No, they usually run on time until they wind down and then just stop. As it most likely hasn’t been serviced in the last decade, it’s time. Your watchmaker should be able to perform a service (clean, lube and adjust). Parts for these are only available from Omega directly, so if your watchmaker doesn’t have a parts account, he could perform the cleaning and lube part, but if it needs parts (like wearable parts, or new crown etc). Then he may have a hard time sourcing them. Don’t let him put generic parts on this - like the crown or crystal. Omega crystals are still available if it needs one, but they usually polish out well if it’s not cracked or crazed.
 
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I don't know. My father can't tell me anymore ;-)
But would the behaviour I described be standard behaviour for a well-maintained watch?

Not really, it would actually gain time as the balance wheel changes its beat (but that's getting a bit technical).

There are things to do to confirm if it's working well.
Even though it's an automatic (and it's a quality movement) it needs to start with a "full tank".
So, if it's to be worn daily, wind it manually for about 50 turns of the crown when you get out of bed. Wear it all day and note any deviations (gain / loss) at the end of the day. This will indicate if it's running properly or not.

A mechanical watch of this age needs to be properly serviced every five years or so to keep them in top condition. If you can't pin down it's last service date, it may be time to start looking for a watch mechanic.
 
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Thanks you for all the responses, and also the supporting words about my recent loss. I am going to look for a qualified watchmaker and have it serviced.
 
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Good outcome.
👍
I have my Dad's Omega Geneve in my watch drawer and don't often wear it, but when I do, I always think we're both sharing the same small smile when we look at the dial.
 
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Good outcome.
👍
I have my Dad's Omega Geneve in my watch drawer and don't often wear it, but when I do, I always think we're both sharing the same small smile when we look at the dial.

I have a friend who wears his Dads watch every Xmas day so he is at the table with the family. A nice touch ;0)

@Cronos42 - for £99 Omega will search their archive and send you a digital extract plus a signed hard copy showing any information they have. Not normally economic it for this level of watch but it might be nice as a family record if you don’t have the box and papers. They only charge if they can find the information.

https://www.omegawatches.com/customer-service/extract-of-the-archives
 
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I have my father’s 1950’s Baum & Mercier 18k chronograph (Landeron based). It’s not an incredibly valuable watch and the dial has water damage (he was a surgeon and washed his hands constantly- wrong watch for that line of work), but I get it serviced about every decade and wear it on special family occasions- as a tribute.
Family pieces aren’t about value or cost of maintenance versus worth- they are family pieces and if we value the family member who owned it, we keep them up.
Now if the family member was a piece of shit- watch can go in the trash.