Omega Seamaster 752 questions

[meanoldmanning]

I’ve been tasked with cleaning up a friend’s 166.089 Seamaster but wondered if anyone here has any experience with them.

First, I’ve found a couple walkthroughs for the 752 mov’t but wonder if anyone has an actual service manual or knows what equivalent mov’t it might be based on

Second is the crystal. It appears to be glass, is that correct? It also appears to be pressed into a plastic ring in the case, is that correct.

It’s seen some water and the case is pretty heavily polished. Owner knows this. His collection otherwise is extremely impressive so he gets a pass on this one.

[stuart]

I'd nip on over to OmegaForums and ask there, you'll get plenty of help.

The 752 is based on the same design as 552 (no date) and 565 (date) and are pretty straight forward.

[philsinclair]

Hi. Since its been heavily polished and is still rough looking , consider a case replacement from Omega. Cheers Phil

[kue]

It looks like an acrylic tension ring type crystal, whether it's correct or not, I don't know.

I've yet to find a service manual all these years, so I would be interested myself if you found one, but Stuart is right, these are pretty straightforward. If you've serviced a swiss movement then you'll know what to expect.

[pip]

I’ve checked through my Omega stuff and best I have is what looks like a parts list.

[meanoldmanning]

Thanks all. Yeah, service guides are nonexistent I guess. Found the parts list on cousins. Be nice to see an oiling guide for it, though I guess as stated it’s not so different from anything else. Mostly need to pick up a bunch of replacement screws and maybe a new barrel/arbor/ms.

Case is what it is. My friend realizes it’s polished heavily but is content with that. He’s more of a chrono guy and his small collection is quite impressive. So this is more of a beater that he would like to having running well. Oh, and a nicer chapter ring.

[leffemonster]

I’m assuming you’ve already come across this -

watchguy.co.uk/service-omega-seamster-166036-calibre-752/

[meanoldmanning]

Yes, that was one of the walk throughs I found. I have it saved.

[Adrian-VTA]

It's assumed you know what to do with it so no service or oiling guides were made from what I'm aware of.

The crystal looks like mineral glass pressed into a urethane seal. The urethane seals are a bastard to source.

Does it have a back or monocoque case?

Aug 13, 2019 6:18:40 GMT -8 meanoldmanning said:

Thanks all. Yeah, service guides are nonexistent I guess. Found the parts list on cousins. Be nice to see an oiling guide for it, though I guess as stated it’s not so different from anything else. Mostly need to pick up a bunch of replacement screws and maybe a new barrel/arbor/ms.

Case is what it is. My friend realizes it’s polished heavily but is content with that. He’s more of a chrono guy and his small collection is quite impressive. So this is more of a beater that he would like to having running well. Oh, and a nicer chapter ring.

[meanoldmanning]

Aug 15, 2019 7:24:13 GMT -8 Adrian-VTA said:

It's assumed you know what to do with it so no service or oiling guides were made from what I'm aware of.

The crystal looks like mineral glass pressed into a urethane seal. The urethane seals are a bastard to source.

Does it have a back or monocoque case?

Aug 13, 2019 6:18:40 GMT -8 meanoldmanning said:

Thanks all. Yeah, service guides are nonexistent I guess. Found the parts list on cousins. Be nice to see an oiling guide for it, though I guess as stated it’s not so different from anything else. Mostly need to pick up a bunch of replacement screws and maybe a new barrel/arbor/ms.

Case is what it is. My friend realizes it’s polished heavily but is content with that. He’s more of a chrono guy and his small collection is quite impressive. So this is more of a beater that he would like to having running well. Oh, and a nicer chapter ring.

Hey Adrian! Been wondering where you’d got off to.

It has a screw down back. So, that easy enough.

Yeah, it’s a mineral glass crystal. I was concerned about sourcing the seal so hadn’t messed with it yet. Would love to source a chapter ring that is cleaner but if the seal for the crystal is going to pose a problem it’s probably not worth it

Kind of disappointed about the service guide situation. It’s obviously not too unique a design but I figured Omega would have offered some supporting docs.

[Adrian-VTA]

The Swiss are a pack of bastards and like to keep things secretive.

Service guides for Swiss stuff is only a relatively new-ish thing.

You can usually reuse those seals if you are careful with them. On the yellowing, you could try retro brite maybe? 

Aug 15, 2019 7:51:46 GMT -8 meanoldmanning said:

Aug 15, 2019 7:24:13 GMT -8 Adrian-VTA said:

It's assumed you know what to do with it so no service or oiling guides were made from what I'm aware of.

The crystal looks like mineral glass pressed into a urethane seal. The urethane seals are a bastard to source.

Does it have a back or monocoque case?

Hey Adrian! Been wondering where you’d got off to.

It has a screw down back. So, that easy enough.

Yeah, it’s a mineral glass crystal. I was concerned about sourcing the seal so hadn’t messed with it yet. Would love to source a chapter ring that is cleaner but if the seal for the crystal is going to pose a problem it’s probably not worth it

Kind of disappointed about the service guide situation. It’s obviously not too unique a design but I figured Omega would have offered some supporting docs.

[stuart]

Is the case 166.0089 the same as 166.089? Cousins have the crystal and crystal gasket for 166.0089 - Crystal TN5194 and gasket 098EG0007

[kue]

Aug 16, 2019 6:05:30 GMT -8 stuart said:

Is the case 166.0089 the same as 166.089? Cousins have the crystal and crystal gasket for 166.0089 - Crystal TN5194 and gasket 098EG0007

Yeah it's the same

[meanoldmanning]

Awesome! I had noticed a couple other places had the case number listed with the extra zero. Meant to ask about that.

[stuart]

I wasnt sure about the case numbering as sometimes the extra 0 in the number could be a different case.

If you need to be certain of the part numbers, Al (Archer) on Omega Forums and WUS will often provide the info, he's a certified Omega watchmaker and has access to all the numbers etc

[kue]

The Omega Vintage archives is a good place to check, but it sometimes requires the additional 0.