Modifiche

A special thanks to Jeff (FPN user "Jeff L") for providing such interesting information (please see the link below in the references).

A special thanks to Jeff (FPN user "Jeff L") for providing such interesting information (please see the link below in the references).

== External references ==

== External references ==

* http://www.fountainpennetwork.com/forum/index.php?/topic/216210-carter-pen-numbers/page__pid__2270265

* [http://www.fountainpennetwork.com/forum/index.php?/topic/216210-carter-pen-numbers/page__pid__2270265] Discussion on FPN forum

== Related material ==

== Related material ==