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FOR SALE: A pair of NOS Bohlender Graebener "Ribbon" Transducers RD 50 and RD 75

Bumping up this old thread for a question.

I have a pair of BG In-Wall speakers that I just got. Never used, one was still in a sealed box. The sticker on the box shows it is in the Radia family - RD-50 and RD-70 are listed under in-walls. There is also something handwritten, and my best guess is it says RD-35. But I can find nothing on the interwebs about an RD-35 model.

The entire speaker is 35" x 7". It has 4.5" drivers on each end, two 7" ribbons or one 20" ribbon - can't tell because there is a 1" tweeter mounted above the middle of the ribbon.

Just hooked the pair up for a few minutes of testing, sounds amazing.

I see lots of SoCal people on this thread, me too!

Anyway, anybody know anything about a BG Radia RD-35? Does it exist?