Omega Speedmaster 125, correct back seal?

[Bernhard J.]

Hi,

I recently looked into my Speedmaster 125. Upon unscrewing the back I found a black goo, which apparently had been a seal long time ago. Quite a mess to remove, but I managed.

Now I am wondering about a correct seal. It should be 35 mm, but with what cross section and cross section dimensions? Seals may be of round or square cross section. The material should not be all too critical, since the watch will anyway not be exposed to water.

Strangely I find nothing using Google (or I am searching wrong). Since the 125 case is quite different from the "normal" Speedmasters, it might be that the seal is not the same?

Cheers, Bernhard

 

[roughbarked]

Hi,

I recently looked into my Speedmaster 125. Upon unscrewing the back I found a black goo, which apparently had been a seal long time ago. Quite a mess to remove, but I managed.

Now I am wondering about a correct seal. It should be 35 mm, but with what cross section and cross section dimensions? Seals may be of round or square cross section. The material should not be all too critical, since the watch will anyway not be exposed to water.

Strangely I find nothing using Google (or I am searching wrong). Since the 125 case is quite different from the "normal" Speedmasters, it might be that the seal is not the same?

Cheers, Bernhard

For a start, the case numbers should be there, inside the back so that you can order the correct seal but is it a flat seal or an O-ring? Usually the O-rings sit i a groove and thet flat seals don't.

 

[Bernhard J.]

Omega does not longer supply parts to private persons, that would be too easy ...

I would not be happy with bringing it to a concessionare, who mails it to Omega, who do strange things with the watch and then return it only after payment of $$$ ...

 

[roughbarked]

Besides, parts suppliers are not private persons. They also would still have the case numbers and seal sizes in their books.
Anyway, if it is a groove, use the verniers to get the inside and outside dia. This should give you your seal. Something that fits the groove fully.

 

[John Cote]

I believe that this should be a round profile seal. I think if you find one that fits in the groove it will work just fine...especially since you won't be taking it diving.