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So not a numbered movement and inscribed "Unadjusted". The opposite of what might be considered as the marks of a chronometre.
Did a Google for "Universal Geneve H.P.C."
Quite a few results, too many to list here but found this one
http://www.watchespriceguide.com/wristwatchdetails.php?watchid=13852
Note in the description "... H.P. C.High Precision Chronometer designation by Universal for the watches tested at the Bureau de Controles des Chronometres."
But again we still have no independent evidence that the statement re. H.P.C. is true.
I think we've seen this wording in a number of Antiquorum catalogue descriptions. I suspect it was just lifted from Sala which uses the same description on page 220.
I personally think that it is very unlikely that the individual movements in HPC watches were tested as otherwise we would see serialised movements.
Given that most (all?) of the 'Chronometre' dials we see are on time only watches and that most of the 'HPC' dials are on chronographs, could it be that UG created its own internal standard of accuracy, HPC, for marketing purposes because its chronograph movements did not meet chronometre standards of time-keeping?
Just an idea.
This latest H.P.C. fails on at least 2 marks of the normal chronometre, the movement has no Serial No. and it is marked as "Unadjusted".
Yes, I think we can be certain that watches with HPC dials are not certified chronometres.
The question is, what are they?
Given that the HPC watches appear to be identical to their non-HPC equivalents, I don't think we'll answer that question by looking at examples of HPC watches. I think the only way that we'll shed any light on this is by finding advertising, literature, price lists etc from the time.
I suspect that someone has misunderstood/mistranslated "Bureau de Controles des Chronometres". I've done a search and can't find anything except it means "Chronometer control office" which is probably a general description not a specific testing agency.
Hello! Been doing some research on UG chronometre and stumbled on this thread and wanted to share there was a tri compax with chronometre on the dial and serial numbered movement that sold on Matthew Bain recently: https://www.matthewbaininc.com/watch-details/2977
Would this prove the content of the ad in the first post of this thread?