As I remember, all the B&S tapers are slightly different in taper than each other, the result of lack of fine measurements when they were made. One of them, #9 or 10 was not even close, as the result of a mistake and it had to be initialized because the machines had already been sent out.
I am sure it is Pratt & Whitney as it has Hartford under the P&W. Is doesn't match anything Morse, Brown & Sharp, or Jarno. As found in these charts. I found a manual for a Pratt & Whitney mill that used a B&S #9 with a drawbar in the spindle. It must be a custom taper for either a tail stock on a P&W lathe or a screw machine. It is a 1 inch 2 flute endmill or a counterbore
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