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circle K is for kasai eyepieces, the in recent times mostly had orthos, some erfle's--in the past they may have had other variety
in older times circle K was Koyu [read old vixen], it has also been Kenko & King optical
at a guess id be saying amasco was koyu/vixen
Chris E may be able to shed more light. I have read somewhere someone say circle k is also pentax, but I can't remember sf there ewas any evidence
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