Hi,
5098 is not a chronometer, but a "Chronometro Gondolo", after the name of a south American historical PP retailer of the early XXth century.
All form dress models from PP generally bear this name.
Chronometro is the specialty of the store like a famous watch store in Switzerland is named "Chronometrie XXXXX"!
The COSC certificate has little value IMO has only the calibre is tested, before being cased, and most basic Swiss calibres can stand easily thge COSC certification if they are correctly regulated! The production techniques today are much tighter than they were before. So passing the COSC standard in itself is not exceptionnal.
Then I can understand why a company would pass the COSC tests if the result at the test are particularly good. I personaly don't own a PP tourbillon so I've never seen a COSC certificate of a PP tourbillon, but I hope such certificate show an exceptional result.
If someone owns a PP tourbillon here please share!
PP gets a COSC certificate for all its tourbillon models and also for some limited editions.
Cheers
Dje