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Calculators: Vanguard
Brand from Cahue Industrial S.A. based in Spain.  Cahue made radios, TVs and a range of domestic electrical goods in the 1970s.  The example of the X-800 is a very early single IC calculator from 1972.

 
X-800 X-802

X-800
1972
X-802
(Type I)
1974
X-802
(Type II)
1974