6 1/2 by 8 1/2 inches was full plate size. That may be what you have.
Most likely 6.5 x 8.5 inches. Here is a link for 6.5 x 8.5 x-ray film on e-bay, I have no affiliation to the seller. I may order some because I have a whole plate back for my Rittreck. https://www.ebay.com/itm/166761314281?_skw=6.5X8.5+XRAY&itmmeta=01JQ9SV6SXY05Z88K9PEEB1V6Y&hash=item26d3bfb7e9:gZMAAOSwrudlRQiO&itmprp=enc:AQAKAAAA0FkggFvd1GGDu0w3yXCmi1e7k0L06XLbJjSMT47A4gNnPYNlOCkxAVBXlAANjbi1fuTLG2yqvEbRpuMA/2f8J6bWbv31sGsoBveRpLBDCUWXY0GK6hm/ykMDY8o/qzrp8JMoQPgp3UXaIJ7p1weMPEZBfddLstJQNvgcaRm4qM+0cBiZuOcMsUIPXVkqlNvmBUPTsZLTEhIFQmJ+hKRa8gylZgt0e2YWqlNWnf+wBGrOJjy2B0Xp5kHVqiBVplFchNVj0YQfq8qGFoFAx9+L3+I=|tkp:Bk9SR5Tt7Lm6ZQ
6 1/2 by 8 1/2 inches was full plate size. That may be what you have.
A minor correction, Toyo cameras were made by a company called "Sakai." Not Seiko. Seiko is a separate company that made camera shutters; the well known watch company is related.
Sakai: http://camera-wiki.org/wiki/Sakai_Special_Camera_Manufacturing
Seiko/Seikosha/Hattori: http://camera-wiki.org/wiki/Hattori
That will probably help with google searching.
One of Sakai's earlier cameras, unfortunately not listed on camera-wiki, is the original Sakai Special / Toyo metal folding field camera, labeled 4-3/4 x 6-1/2 on the rear standard. That's half-plate size, and the camera usually shows up with either a standard 4x5 spring back or a half-plate back. So it would not surprise me if Sakai made a whole plate camera.
One of Sakai's earlier cameras, unfortunately not listed on camera-wiki, is the original Sakai Special / Toyo metal folding field camera, labeled 4-3/4 x 6-1/2 on the rear standard. That's half-plate size, and the camera usually shows up with either a standard 4x5 spring back or a half-plate back. So it would not surprise me if Sakai made a whole plate camera.
I have that camera, and it came with a 4x5 spring back as you mentioned. I think I got it from @B.S.Kumar although I'm not 100% certain at this point; it's been a few years. Had to replace the bellows as the old ones were shot. For this camera, an larger back (with an additional bellows I think) was available so it could be used for 5x7" (I think I saw one for sale, once, and stupidly didn't jump on it); maybe there was a half-plate back for it in a similar vein. It is definitely not what's shown in the OP since that's apparently for a monorail camera, but the build and finish looks very much like my Toyo camera.
The additional extension back was much larger for Whole plate 8½" x 6½".
Most likely 6.5 x 8.5 inches. Here is a link for 6.5 x 8.5 x-ray film on e-bay, I have no affiliation to the seller. I may order some because I have a whole plate back for my Rittreck. https://www.ebay.com/itm/166761314281?_skw=6.5X8.5+XRAY&itmmeta=01JQ9SV6SXY05Z88K9PEEB1V6Y&hash=item26d3bfb7e9:gZMAAOSwrudlRQiO&itmprp=enc:AQAKAAAA0FkggFvd1GGDu0w3yXCmi1e7k0L06XLbJjSMT47A4gNnPYNlOCkxAVBXlAANjbi1fuTLG2yqvEbRpuMA/2f8J6bWbv31sGsoBveRpLBDCUWXY0GK6hm/ykMDY8o/qzrp8JMoQPgp3UXaIJ7p1weMPEZBfddLstJQNvgcaRm4qM+0cBiZuOcMsUIPXVkqlNvmBUPTsZLTEhIFQmJ+hKRa8gylZgt0e2YWqlNWnf+wBGrOJjy2B0Xp5kHVqiBVplFchNVj0YQfq8qGFoFAx9+L3+I=|tkp:Bk9SR5Tt7Lm6ZQ
Fuji HRU is less expensive IF you are willing to cut it down from 8x10:
I have that camera, and it came with a 4x5 spring back as you mentioned. I think I got it from @B.S.Kumar although I'm not 100% certain at this point; it's been a few years. Had to replace the bellows as the old ones were shot. For this camera, an larger back (with an additional bellows I think) was available so it could be used for 5x7" (I think I saw one for sale, once, and stupidly didn't jump on it); maybe there was a half-plate back for it in a similar vein. It is definitely not what's shown in the OP since that's apparently for a monorail camera, but the build and finish looks very much like my Toyo camera.
The 5x7 extension back for these is the subject of some rumor, there is an old thread on the LFphoto forum about it, and I think B.S. Kumar or somebody suggested that there may have been a 5x7 back for a Toyo monorail that was very similar looking. I'm not sure the 5x7 extension for the field camera is real, and sightings may have been of the whole plate extension back.
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