I have an oddball 7-1/2" 3 jaw scroll chuck w/reversible jaws that mounts on a 2"x8tpi spindle. Trying to figure out what make chuck it is and what lathe ran that spindle size. The spindle measures 1.985"d and the thread pitch gauge seems to be spot on at 8tpi. The only writing is in pic 2. Any help figuring this out is appreciated.