CASIO V121-S

Casio root 121-S

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Date of acquisition: 2012/02/08
From: 

 Square root function :

 Negatif numbers, a red minus sign appears on the left :

 Serial number : B 71 12 43 - Date : december, 1971

 Half zeros, all the zeros - even useless ones - are displayed :
Watch model : 121-S