• Production : 1972 - 1973
• Display : LED 8
• Power : 4 x LR44
• Made : UK


• One of the first real pocketable
  calculator
• Version 1


• Additional information 1
• Additional information 2
• Advertising 1
• Advertising 2
• Advertising 3 (swi)

• Production : 1972 - 1973
• Display : LED 8
• Power : 4 x LR44
• Made : UK


• Version 2
  

• Production : 1974 - 1975
• Display : LED 8
• Power : 2 x AA
• Made : UK


• Additional information
• Cambridge serie

1974

• Production : 1974
• Display : LED 8
• Power : 4 x AAA
• Made : UK


• Scientific model


• Additional information

1975

• Production : 1975
• Display : LED 8
• Power : 9V
• Made : UK ?


• Additional information

1977

• 
• Production : 1977
• Display : LED 8
• Power : 2 x 625
• Made : UK


• Special calculator made for the 50
  years Queen Elizabeth's reign
  celebration. Sold in a luxury box.
• Also exist in silver or gold-plated
  versions, and in solid gold too.


• Additional information
• Advertising 1
• Advertising 2