Bronica GS 135-SW 24x69mm Panoramic Back for 35mm film on the GS-1 6x7cm Medium Format Camera
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The panoramic backs for the ETR and SQ cameras produced 24x54mm images, but for the GS-1 a much more interesting GS 135-SW 24x69mm model was planned. This is even wider than the much-lamented Hasselblad XPan (and Mamiya 7 with Panoramic adapter), which used a 24x65mm format.
We weren't sure this interesting accessory was ever sold, though. While we remember reading about it at the time, and it appeared on the system chart in the camera’s instruction manual (as shown in our scan here), we couldn't find any evidence that it ever existed as a physical product. However... we recently came across this thread (in Chinese) which includes this picture. A panoramic back is clearly visible at the top right – is this perhaps the elusive 24x69mm model?
The cropped pictures below weren't taken with this mythical product, but show the correct 2.875:1 aspect ratio of the 24x69mm format:


UPDATE: Here's a Bronica user who's created 35mm panoramas on the GS-1, with a more DIY approach:
https://www.flickr.com/photos/digi-film/sets/72157627080307151/with/5944582999/
UPDATE: Here's a press picture of the Bronica GS-1 from 1983 with all the backs, including the 35mm panoramic:
