Hi all, many thanks for the suggestions. I was aware of skgrimes, but was leaving it as my last resort, as I'm in Ireland, and customs, VAT, shipping, add up. At least have a fallback options, if other things do not pan out as well.
I managed to source some images from the 1970s Calumet catalog; it seems that effectively it uses a series 9 filter. It even gives a product code for the adapter, 85SS9, probably unobtainable by now.
I'll try to source a push adapter for the outside cell diameter, 85mm, while doing some bricolage meanwhile.
According to Calumet every Caltar of this generation is a 4 element lens - it doesn't jive with some rumors I read that the 14 3/4 Caltar is a triplet.
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