Pratt Burnerd model 1273-32515 10” / 3-jaw lathe chuck with 3.5” tapered shaft. Made between 1968 and 1980. The current version of this unit is model 1023500 (https://www.prattburnerd.com/products/manual-chucks/self-centering-chucks/self-centering-234-235-series-3-jaw-chucks/) and sells for $3,910.50 (fob Thomas Skinner & Sons, Richmond, BC). The image shown is a new unit. I’ll get an image of the actual unit that I’m selling soon. All offers considered.