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Springbars - I found a source!
So whenever getting a bespoke strap made by any of the strap makers as Camille Fournet or the OEM Jean Rousseau the answer to the request for quick release springbars is always no because they don’t have them, and when Rousseau makes the OEM straps (or you order through an FPJ boutique) they are supplied with the bars by FPJ.
After a lot of trial and error I stumbled on the exact correct bars with the Patek type stepped pin at one end and the flat topped button. These are in fact 1mm longer than a standard QR springbar so easily absorb the slight shortening that happens from being curved to such an extreme.
They are available as single pieces from Esslinger. Use the code on the packet to order.

Thanks and a few questions
By: kkwn98 : June 20th, 2019-07:30
Thanks very much for this very useful information, much appreciated! A question, however: do you know of anyone who supplies these springbars in precious metals? I ask as I understand that you should match the springbar material with the case material, so...
Strap Change Question
By: Burgie : December 25th, 2023-08:31
I have a Chronometre Bleu without QR springs bars. I am in the process of ordering a smaller strap and am concerned about damaging the lugs while removing it. These straps are super flush with the lugs and seem like it would be hard to fit my spring bar t...
JR
By: avseg : July 11th, 2019-21:43
The Jean Rousseau NYC boutique manager told me that FPJ supplies OEM QR curved spring bars but they are for FPJ boutique orders only - they are not available to the public. The NYC boutique has had no problem supplying me with (non-QR) springbars that fit...