MT3 tailstock Collet holder ID

Ulster Marine

H-M Supporter - Silver Member
H-M Supporter - Silver Member
Joined
Apr 15, 2019
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9
Can anyone identify this collet holder? The only markings visible are "(A-60570)" on the shank, and ½ on the collet although the collet is definitely not ½", but rather ⅜".
 

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I tried a piece of ⅜" drill rod and it wouldn't fit.
 

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Is there a square at the bottom? Good chance it is a tap collet for a 1/2” tap. Which bizarrely have smaller shacks than 3/8” taps…
 
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