I have a student with one and I really like the feel and quality of it and think it would be great for some lesson horses/students. Hers has brass hardware, 4 rein-ds, and snap reins that buckled in the middle. Anyone know where I can get one?
These might not be exactly how you want them, but I bet they'd customize to your specs. These use a breast collar for the short straps, but it's easy to have them make a different setup or just make something yourself.
Here's what I found... Kind of expensive compared to a leather german martingale but then again I have a biothane work bridle that I've had for 10+ years that looks brand new and maybe has been wiped down a handful of times That stuff lasts forever!!