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Jim McShane could best describe it.

Hopefully Jim McShane weighs in here. I can't tell from the construction.
My thought is from the date it would be at least type II or possibly type I.
There used to be web site, which I can't find, that had pictures of the different evolutions of the EI KT90. It was on the Manley Labs web page.



Edits: 10/20/16 10/20/16

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