Wow, the people that I know in real life all love their Devoucoux saddles.
I spoke with Devoucoux about this saddle, so I know what the 'party line' is about its particular configuration. I was just hoping that there was someone out there with nothing to gain/lose who could translate.
You're probably better off emailing a devoucoux rep, since I think those numbers/letters describe the panel configuration.
On a side note, a lady I used to ride with was a devoucoux rep and was super easy to work with. When I had a different rep out to fit me, she was very helpful and professional. Nearly everyone in my barn has a devoucoux and I haven't ridden in one I didn't like. I prefer CWD but have nothing against devoucoux.
eta: didn't see that you spoke to devoucoux...they didn't tell you what kind of horse's back it works best for?
OP: I have a Devoucoux (Oldara), right here in the house for oiling, so I flipped it over. Mine is a medium everything on the "horse fit" side, and an 18'' 2aa on the "people fit" side. Other than the top set of numbers being PX5 as opposed to PX6, my numbers are all the same as yours. I love mine, it's fit all but one horse very well, and that one horse is my step-mare, who is a Sherman-freakin'-tank, so it would roll on her a little bit. I'd say I've had it on...six or seven different horses, from ponies to Halflingers to QHs to a WBx.
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Devoucoux likes to play its codes pretty close to the chest. I've not yet gotten them to translate even one of these codes for me. CWD and Butet, by contrast, will gladly talk your ear off about their various panel codes and what they mean.
If I wanted to hedge bets about someone non-affiliated with Devoucoux who *might* have elicited what those codes mean, my money is on Cori McGraw of High End Used Saddles or Patricia whats-her-face at Fine Used Saddles. Both have seen and sold a jillion Devoucouxs.