[rollei_list] Rolleiflex lens hood size question

I have just received what the eBay seller described as a Bay II lens hood. Unfortunately it does not fit on my 3.5F, which seems to want a hood with an internal diameter of 42mm whereas the hood I have is only 37.5mm.

It would be nice to tell the seller what the hood actually is when I return it. There are no markings on the hood other than the "Rollei F&H" in white script on the black metal part of the hood. The box says "Rolleiflex" and "Rolleicord" and not "II Planar Xenotar 3.5". I guess it must be Bay I?

Is there a web page/mailing list posting/book that lists the physical sizes of the various Rollei bayonets? I didn't find anything very useful, but maybe I asked Google the wrong question.

Tim Rylance, Bath UK
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