An important way to learn about different models of IWC pocket watches would be to study the historical literature. Fortunately, several catalogs, price lists and parts supply books exist. These show various models, and frequently include diagrams. One should realize that many dial and case-style variations were produced, and not all are illustrated.

I have initiated an IWC Vintage Catalog Project, which can be accessed at:

www.iwcforum.com/Vintage_Catalogs.html