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The 1390120 is a model M without LEDs for a late variant of the IBM XT.
The 1390120 is the most common early model M on ebay.
/*pz*/char p[]=" ELPRTWZ";unsigned z[]={553179788,1641}, _=14;main(){while(_--)putchar(p[z[_/012]>>3*(_%10)&7]);}
(K) All Rites Reversed