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The K designation stands for the Kelner design. These can be pretty decent. The AH I think is a Huygens or Huygens-like design, but I spotted some very positive comments on Cloudy Nights, listing as main drawback the rather narrow FOV

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Hi Michael thank you for your response. Yeah it's an achromatic Huygenian. I think these could be from the 60s or 70s and perhaps made by Towa for Swift Optics but I'd like to know more. Having had a wee look at them the optics look so good I'm thinking of getting a 0.965 adaptor and hanging on to them.na

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5 hours ago, adictd2dalite said:

I think these could be from the 60s or 70s and perhaps made by Towa for Swift Optics but I'd like to know more.

The circle-T mark means Tani optical house.  They were best known for their volcano top orthoscopics sold through University Optics, Kokusai Kohki, and many others.

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https://www.cloudynights.com/topic/465378-circle-t-towa-or-tany/

Loooks like Tani made eyepieces.~ see sketch in thread.

AH= achromatic huygenian i think?

I have corresponding 1.25" circle T Kellners,which i like.

You shouldn't lose any AFOV in the  12mm & 20mm & (maybe even 25mm?) in the smaller format compared to 1.25" versions.

😉

They look a nice set,~great for a classic refractor.

I've not seen volcano tops in .965" format, usually it's a (i don't have a name for the usual type of top in japanese .965")

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