F300 Constellation

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My father recently gifted me his F300 that my mother bought for him. I was keen to see if anyone could pass on any knowledge, the case back doesn’t have the observatory badge, would this indicate this is a non omega manufactured case?

Appreciate any information. Is a nice experience to wear a smaller gold watch after years of 40mm plus divers and speedmaster.
 
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It is a nice watch. My guess is it is a ref: 198.003 I have seen f300 Constellations and Seamasters with plain casebacks like this before. I can find examples from this reference with the observatory and some without. I am not sure why.
 
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You should open the watch and look inside the caseback
 
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I can't answer the question about the case back, but there are so many things about these watches that I like. The proportions, the baton / paddle hands, the red accents, and the fact that they can be worn on rotation without having to reset the time! I have a steel one, but I'm seriously tempted by a gold one to go with it.
 
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the case back doesn’t have the observatory badge
It’s also possible it was a blank back so it could be inscribed.
 
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Looks like a 198.003 f300 from the early 1970’s.
It has a tuning fork movement and you can hear it hum!

For regular mainstenance, you need somebody that does Accutron movements as a specialty because they are very different than conventional movements. That said, I had mine done by a gentleman based in Thailand (and I live in Boston!). It went really well and recommend it. Less expensive too. The movement in the Omega F300 is the best of the tuning fork models and the only tuning fork model that could be chronometer certified.

Here’s mine.
1279726-f5ab036a6852c896e5a92f7ad73d4817.jpg

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Thanks all for your posts, very useful.

Take @Deafboy's advice. You might be able to find a watchmaker whose skills with tuning fork movements match Rob in Thailand, but they will charge 3-4 times as much. I recently bought an accutron off eBay that had some questionable work done on it by some hack in an attempt to get it working. I sent it to Rob and he had to replace the coil assembly and tuning fork. Total bill for repairs and service plus shipping back to California was only $308 usd.

Rob also has connections in the Thai mail service. The watches don't go out in a regular mail truck, they are held at the post office by an associate. He says that a watch has never gone missing in the many years he has been doing this and I believe him.
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I can highly recommend Ludmil in Bulgaria too ! I'm not sure how the service question came up though because the OP didn't ask about it ?

Anyway I have this very watch and also wondered why it didn't have the observatory badge...It is indeed the BA 198.003 and the serial on mine points to 1972.