Thank you. I sent a message to the seller of the holder. Attached is a picture that show more details regarding the Kearney & Trecker 1-3/4" Shank Tool Holder. See the retention button and the ball bearing ring?
Your K&T holder looks like one from a machine with a tool changer. There were a couple different sizes.
We tried to salvage some K&T 180 size when we bought a new 200 many years ago. The straight shank holders had developed so much wear/runout we gave up and bought new ones. I'd check that before spending a lot of money.
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