At what point is my new Deville Tresor running too fast?

I recently purchased a new Deville Tresor. When the UPS guy delivered it, it wasn't running so I have it a full wind. After about 4-5 twists of the crown the watch started running as expected.

I did a little test to see how accurate this watch really is. After a full wind, I set the Tresor to the exact same hour, minute and second as my Timex Ironman (quartz) and my Orient Bambino v4 (automatic). After about 20 hours the Tresor is 5 seconds faster than both the Timex and Orient.

Is running 5-6 seconds fast after about 24 hours normal? I've been reading about the 'state of the art' movement found in the Deville Tresor and so I'm a bit concerned that it's not holding steady with two other watches, especially given the amount the Tresor costs! Interestingly, the time on the Timex and Orient are in lock-step after 20 hours.

BTW - I bought the Tresor from a reputable website - not an authorized dealer - and also had a reputable Omega repair shop take a look and verify it's authenticity. So I'm not worried that this watch isn't anything other than real.

🤦


When you can't catch it anymore.

mechanical watches lost that battle nearly 50 years ago.

I fully understand that any mechanical watch will run faster or slower than a quartz. What I want to know is at what point does a mechanical watch need to be serviced because it's running faster/slower than is acceptable. The Deville Tresor has a 8511 caliber movement. Is it OK that this movement can/will run 6+ seconds fast over a 24 hour period?

Found this website which sheds some light on accuracy of manual watches:
https://www.prestigetime.com/page.php?accuracy

The last time my edc with an ETA movement came back from the watchmaker, it ran within 1 second every 3 days, which isn't that far from a good quartz watch that can be within a second every 10-15 days. But after a couple months it settled into gaining about 5 seconds a day, where it has remained since. My watchmaker tells me that's normal. It was also off by 5 seconds a day when it was new.

Good to know. Thanks.