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Vintage Omega F300 Buying Advice: Model Suggestions

f300 omega vintage
Michael Purwoadi
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Hallo, I have an Omega Constellation Chronometer F300 as shown in the picture since a year ago.I bought it second. During first 6 months, it worked remarkably accurate with a drift only 1 minute utmost. I didn't use it often because Omega is quite a luxurious brand in our country. After several months in it's box, I found that it has 5 minutes in advance. Because, I didn't know yet how to correct the index, I put it again in it's box. Last week, I reopened the box and saw that the watch has 6 hours late. After, correcting the index, I saw that the second index move slowly, it has now 5 minutes late in 24 hours. So, I would like to know if it is only a problem of battery (Renata 344, which is difficult to find in our country) or there is other problem ? Please advise, thank you.
Regards,

IMG_20260828_184357_508.webp
 
lenndon
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If it was running well before, I could imagine that the battery simply needs to be replaced.

There are several other possible issues with that caliber, though. Generally, I would advise NOT setting the time counterclockwise if you have no information about the service history of the watch. The very fragile index wheel could be damaged in the process, potentially wearing the teeth flat, in which case it would need to be replaced as well. That is obviously a bit more involved than replacing a battery.

A Renata 344 silver oxide battery should be relatively easy to find as a replacement for the original 343 mercury battery. I would not use a different battery type.
 
ketiljo
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The battery normally lasts a year on these. Then the oscillations becomes weaker and they loose time.
 
Michael Purwoadi
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lenndon lenndon
If it was running well before, I could imagine that the battery simply needs to be replaced.

There are several other possible issues with that caliber, though. Generally, I would advise NOT setting the time counterclockwise if you have no information about the service history of the watch. The very fragile index wheel could be damaged in the process, potentially wearing the teeth flat, in which case it would need to be replaced as well. That is obviously a bit more involved than replacing a battery.

A Renata 344 silver oxide battery should be relatively easy to find as a replacement for the original 343 mercury battery. I would not use a different battery type.
Thank you, I hope that it is only problem of battery.
 
Michael Purwoadi
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ketiljo ketiljo
The battery normally lasts a year on these. Then the oscillations becomes weaker and they loose time.
Only a year ? What a drain of power. It is difficult to obtain Renata 344 in my country. I have to ask my friend who travels to Europe to buy this. I hope the battery will be allowed to be brought on the plane. Is it possible ?
 
Spruce
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Michael Purwoadi Michael Purwoadi
Only a year ? What a drain of power. It is difficult to obtain Renata 344 in my country. I have to ask my friend who travels to Europe to buy this. I hope the battery will be allowed to be brought on the plane. Is it possible ?
Go on eBay or Amazon, and buy four batteries online 🙂

I have three calibre 1250 watches and I use these batteries (and have done for some years) which I bought online and which seem to work well

IMG_0684.webp
 
Michael Purwoadi
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Spruce Spruce
Go on eBay or Amazon, and buy four batteries online 🙂

I have three calibre 1250 watches and I use these batteries (and have done for some years) which I bought online and which seem to work well

IMG_0684.webp
I've tried to buy from Amazon, but it asked me to change my delivery address, it can ot send the battery to where I live.
 
Michael Purwoadi
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When the watch is not in use, stopping the indexes by pulling the crown twice, will reduce or even stop the power consumption from battery ?
 
ketiljo
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Michael Purwoadi Michael Purwoadi
When the watch is not in use, stopping the indexes by pulling the crown twice, will reduce or even stop the power consumption from battery ?
Yes, it disconnects the battery
 
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