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Old 25th Mar 2014, 08:48
  #153 (permalink)  
Haraka
 
Join Date: Sep 2010
Location: South East of Penge
Age: 74
Posts: 1,792
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I seem to recall that the "check " digit ( expressed as a letter) was first around in the early 70's at least- if not a bit before. IIRC it then went away as far as we were concerned and then came back again some years later.
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