1st Model Deringer

• Chambered in .41 caliber
  
• Manufactured circa 1870-1890.
  
• Serial number range 1-6500.
  
• Yearly production numbers are not known.

 2nd Model Deringer

• Chambered in .41 caliber.
  
• Manufactured circa 1870-1890.
  
• Serial number range 1-9000.
  
• Yearly production numbers are not known.
  

 3rd Model (Thuer) Deringer

• Chambered in .41 caliber.
  
• Manufactured circa 1875-1912.
  
• Serial number range 1-45000.
  
• Yearly production numbers are not known.

4th Model Deringer

• Chambered in .22 RF short.
  
• Serial numbers have N or D suffix.
  
• D serial number suffix manufactured 1959-1963.
  
• N serial number suffix manufactured 1960-1963.
  
• Total production (D suffix) about 89727.
  
• Total production (N suffix) about 22880.

Lord & Lady Deringers

• Chambered in .22 RF short.
• Serial numbers began at 1001 and have a DER or LDR suffix.
• Manufactured 1970-1973.
• Serial numbers 49201 DER to 60201 DER were shipped in 1976.
• Serial numbers with LDR suffix were shipped in 1970-1972.
• Total production (DER suffix) about 48201.
• Total production (LDR suffix) about 10450.