Speedmaster Professional and chronometer accuracy.

[rkammer]

I've read posts in the past regarding whether the Speedy Pro was certified as a chronometer and was as accurate as a chrono. It's generally stated that it is very accurate but not actually certified by the COSC. While reading my new copy of "The Moon Watch", published by Omega, I came across the following statement (page 132) which is the first time I've read that the Speedy is actually adjusted at the factory to COSC specs even though not submitted for official certification:

"....It is they too (the watchmakers) who adjust the movements. In five positions, to a maximum tolerance of -4 to +6 seconds per day. For chronometer-like accuracy."

It also mentions that they run each watch for 24 hours with the chrono off, and 24 hours with the chrono running. Also, they verify that power reserve is 50 hours. These final tests take about 5 days. Just these few tid-bits for the good of the order.

[JBHII]

rkammer said:

I've read posts in the past regarding whether the Speedy Pro was certified as a chronometer and was as accurate as a chrono. It's generally stated that it is very accurate but not actually certified by the COSC. While reading my new copy of "The Moon Watch", published by Omega, I came across the following statement (page 132) which is the first time I've read that the Speedy is actually adjusted at the factory to COSC specs even though not submitted for official certification:

"....It is they too (the watchmakers) who adjust the movements. In five positions, to a maximum tolerance of -4 to +6 seconds per day. For chronometer-like accuracy."

It also mentions that they run each watch for 24 hours with the chrono off, and 24 hours with the chrono running. Also, they verify that power reserve is 50 hours. These final tests take about 5 days. Just these few tid-bits for the good of the order.

I'm not familiar with the book you mention Ray - where'd you get it? When was it first published?

Many, many watch enthusiasts are of the opinion that COSC certification is little more than a marketing tool. Nearly any modern mechanical movement can hold COSC tollerences between service intervals, especially if regulated at the factory.

John

[rkammer]

John, The book is entitled "The Moom Watch" and was first published by Omega in Switzerland in 1994. I was sent a copy last month directly from Bienne after requesting a copy with the return of a watch my Son had sent in for service. The copy I received is brand new so I believe it is still being printed over there.

[JBHII]

rkammer said:

John, The book is entitled "The Moom Watch" and was first published by Omega in Switzerland in 1994. I was sent a copy last month directly from Bienne after requesting a copy with the return of a watch my Son had sent in for service. The copy I received is brand new so I believe it is still being printed over there.

Very cool! Thanks for the info!

-John