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Koh-I-Noor 1504 (reverse twist lock)
imprint side 1:  
imprint side 2:  
imprint side 3:  
HB  
HB  
HB  
Koh-I-Noor 1504
L&C Hardtmuth Inc.
made in U.S.A.
  6H
  6H
  6H
courtesy Allan Macdonald collection

L&C Hardtmuth “Koh-I-Noor” 1504

(U.S.A., reverse twist lock)

L&C Hardtmuth, Bloomsbury, New Jersey, USA