Burnerd 6" 4 Jaw

  Burnerd 4 Jaw Chuck.
  Model 31Y  (Unconfirmed) 
 
  Very Old Chuck, pre 1960 at least.
  Old and used but these are very well made, and will last for many many more years.
  Jaws and Screws in wonderful condition.  
  6"  Dia, 1. 1/2" Through Bore.
  Would take a safe 7" Dia Job with external jaws at a Safe Max.
  Recces Back 3. 1/4" Dia x 1/8" Deep. 4 x 3/8" on 2. 3/4"  PCD.
  Adapter plate and bolt's supplied but as yet I can't identify what this fits.
  Ref = 1. 1/4" Thread 8 tpi  . 
  4KG's - 
 
  This is wonderful old chuck with many more years of quality work.