What type this ob shaft?
View attachment 590754
gotta see the ferrule and know the taper. what is tip diameter? it was made using the original spiral lamination method. first versions had wooden ferrules and came in mod. pro taper(OB1) at 12.75 and a conical taper(OB2) at 11.75. Here is a OB timeline:
https://www.obcues.com/why-ob/the-ob-story/