Sorry for the complete newbie type question, but here goes. How do you determine what size of nib is on a pen when it isn't stated on the nib? For example, on a Parker 51, Vacumatic or Duofold, it doesn't seem that the nibs are marked as to nib size. Can you only tell by writing with them or do you just have to develop a trained eye (something I do not have yet)?
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