Omega SM 3513.50 (2001) losing time after just 6 hours

Hi guys,

Just bought a Omega Speedmaster 3513.50 online from a guy. Received it three days ago.
Certificate says bought in 2001.

So today I just started to watch how accurate it is.
What I can see, it has lost about 5 seconds on 6 hours.
It is almost bedtime in my country, so maybe I could lay the watch down with glass up to make it gain time, and check it again tomorrow?
And after I bought it I notice some, first I though was scratch on watch hands, but someone told me it may be mold. I’m not sure if that has anything to do with accuracy.

I’ll add some pictures. And the watch is in very good condition with no scratch, so maybe it have been on service not long ago. Not sure, the previous owner bought it on chrono24.

So, Is -5 seconds in 6 hours alot? Is it normal? Should I wait longer to see how accurate it is? Or should I return it?

sorry for my bad english, its not my foreign language.

thanks for accepting my invite on omegaforums, and thanks in advance 😀

so it's about -20/day, it's not too bad if it's consistent but since it's an old watch, it might need a service.
Perhaps other more knowledgable members can help you as i'm not an expert but the finish on those hands and something feels off.

Have you had the watch authenticated?

As the previous post states, the watch is in need of a service.

Thank you so much for answer.
The seller did not tell about the mold, neither that it lose that much time. He said 10 sec/week. He said that he could pay little less then half the serviceprice, which is in my country about $580.

So okay. It need service. Does it need service immediately or could I wait a year/two? And does it need service based on it losing time or the watch hands that has mold/corrosion/not sure?

About authentic. It came with certificate from Japan, with stamp and date, and matching serial so it’s real yes.

it's 20 years old dude so I wouldn't risk wearing the parts any further which might make your repairs even more costly.

As stated above, if you intend to wear the watch, service it. The oils will be dry and the parts will wear. A watch needs to be serviced every 5-7 years.

Went to watchmaker to adjust the band for my wrist, he said that it look serviced because of the condition. There was fresh oil on seals. I’m not sure if he opened it tho. But he said I should’nt service it unless it’s getting bad.

Okay so I bought it for $2300 and the seller said it was all good, and now I have to service it. Is it best to return it and get a full refund? Or get a price discount for $234?

Thank you guys for answer. I really appreciate it. Kind of dilemma. In my country service/overhauling is $560 and it’s expensive