Anyone know for what camera these backs were intended? It is multi-format via red windows and inserts for 6x4.5, 6x6, and 6x9 (85mm length). I've had it for years wondering what to do with it and finally decided to modify it for use with a Graflok back. It only took a few minutes with a Dremel using a cut off wheel to make the slots. The cut off wheels are great. I had previously modified my Speed Graphic to have forward tilt using one.
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