Planet Ocean 2500 question

[theken]

Many of the posts about the discontinued Planet Ocean 2500 series watches include a letter desigination...A...B...C...D.
Will someone enlighten me about the differences and how one determines the letter designation?
Thanks in advance and Happy Holidays!

[joe100]

They're different iterations of the caliber 2500 movement. A and B models are most troublesome because of the way it lubricates the coaxial mechanism. The watch can seize. The C models have fewer problems and with the D they redesigned the whole thing. That's it in a nut shell. Usually this question is like kicking a hornets nest, so if you dig deeper, prepare for wildly varied opinions.

[theken]

Thanks for this information, Joe.
How do I determine which one of 4 movement variants is used in my PO 2500?

[joe100]

Set your date to the 10th, take a picture of the date and post it or PM it to me. I can tell from the date font

[toolr]

Originally Posted by theken

Thanks for this information, Joe.
How do I determine which one of 4 movement variants is used in my PO 2500?

If the number one in the date has a serife i.e. 1 vice a straight font i.e. l it is a 2500D. The 2500D differs from the A, B and C in that it is a three tier co-axial escapement, like the caliber 8500, vice a two tier escapement.

[joe100]

Sans serif it can only be a C

[joe100]

Here u go

[Jack T]

Very interesting and helpful. I have a late model PO 2500, will have to check when I get home. Thanks.

[AndyK]

Also, Planet Oceans only came in C or D. By the time the PO was released Omega had already phased out A and B.

[douglasf13]

Originally Posted by joe100

They're different iterations of the caliber 2500 movement. A and B models are most troublesome because of the way it lubricates the coaxial mechanism. The watch can seize. The C models have fewer problems and with the D they redesigned the whole thing. That's it in a nut shell. Usually this question is like kicking a hornets nest, so if you dig deeper, prepare for wildly varied opinions.

The majority of online instances of issues with the 2500 movement have been the Planet Ocean 2500c, although there are still very few, considering the number of watches sold. It appears the PO 2500c does have some instances of simply stopping out of nowhere, but many of these watches have been officially serviced at this point, and I believe the service called for some fixes, like a new wheel with a different coating.

I wouldn't really worry about it, much. The 2500 movement is still one of the most accurate made. I actually wanted a 2500b movement in my Aqua Terra. It's fun to have one with a 28,800 bph second hand, which was lowered to 25,200 in subsequent co-axial movements.