Pratt Old Type 4.2"

  For the very early imperial Pratt Chuck - pre Pratt & Burnerd era.
 
  Please double check fitment info in pic #2
  for very rare 4. 3/16"  Dia  (106.5mm)  Pratt Chuck.
  These are not compatible with 4" Pratt & Burnerd Chucks  
  Original set with matching serial numbers.