i have bought two Rectar 25cm f4,5. One found on Mercari, one on Yahoo JP.

no data on the whole forum. One incidental mention here: https://www.largeformatphotography.i...=1#post1647302 and one mention of the name on an enlarger lens here : https://www.largeformatphotography.i...l=1#post116782

yes it is listed on the page http://www.subclub.org/fujinon/byseries.htm as early Fuji Tessar, uncoated. That's all. No sources on that page. A common disease it seems among large format people.

btw, the better condition one I bought: https://jp.mercari.com/item/m32488612796

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this will be used for 八切 as Japanese say for whole-plate. The important point will be to see if image circle is enough for front mounting on a Shanel-5, ie. no mechanical vignetting. I have btw the 2-cells for shutter Fujinon/Fujinar 250mm f4.5 and ad hoc Shanel-5B-S, but prefer to screw/unscrew one barrel lens instead of cells. Front mounting a barrel does also no require to remove the board from the front.

Anyway i guess these early Japanese tessar could not sell at all in an European market saturated with German and Soviet tessars, and American market probably the same. Yet it is quite something that there is nothing online.