How were vintage pens made?
How can I tell what a pen is made of?
What is celluloid?
Casein Pens: Most Aren't (Archive)
Solid gold trim
Solid gold pens
Gold and silver pens and their values
Gold marks on pens
Gold filled, rolled gold, and gold plated
Why are so many American nibs not marked 14K?
Repoussť overlays: hand- or machine-made?
Early fine (.999) silver overlays