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[[Carter]] fountain pens are characterized by a numeric code impinted on the bottom of the barrel, which identifies the model. The code is found predominantly on the ''[[flat top]]''  versions in celluloid produced from 1927 (the [[Carter Coralite Pen]]), but is also found for the successive ''[[streamlined]]'' versions and on the [[Pearltex]] versions (the [[Carter Pearltex Pen]]).

[[Carter]] fountain pens are characterized by a numeric code impinted on the bottom of the barrel, which identifies the model. The code is found predominantly on the ''[[flat top]]''  versions in celluloid produced from 1927 (the [[Carter Coralite Pen]]), but is also found for the successive ''[[streamlined]]'' versions and on the [[Pearltex]] versions (the [[Carter Pearltex Pen]]).

Il codice numerico è composto di quattro o cinque cifre (a seconda del codice del colore che può prendere una o due cifre). La cifra delle unità indica la dimensione del pennino, e con questa pure la dimensione generale della penna. Per le [[Carter Coralite Pen]] dimensioni vanno del numero 2, il più piccolo, al numero 7, il più grande. Per le [[Carter Pearltex Pen]] le misure vanno dal numero 2, il più piccolo, al numero 8, il più grande.

The numerical code consists of four or five digits (depending on the color code that can take one or two digits). The units digit indicates the size of the pen, and with this also the overall size of the pen. For [[Carter Coralite Pen]] the number starts from size 2, the smaller, to size 7, the greatest. For [[Carter Pearltex Pen]] these measures start from size 2, the smaller, to size 8, the largest.

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