In addition to the The Pan Handler Facebook page and information contained elsewhere on our site, in our blog, and in this FAQ section, there is a wealth of information on the web to assist you in learning all about vintage cast iron. Here are a few links to get you started!
The Book of Griswold & Wagner (includes sections on Favorite, Wapak, Sidney Hollow Ware), by Smith & Wafford (commonly referred to as the “Blue Book”).
The Book of Wagner & Griswold, A Schiffer Book for Collectors, by Smith & Wafford (commonly referred to as the “Red Book”)
Griswold Muffin Pans, by Jon Haussler.
Wagner & Griswold Society – Wags is a “community of cast iron and aluminum cookware collectors.” I am a dues-paying member of Wags.
There is a wealth of information on the Wags site; some available to the public and other that is available only to dues-paying members. There is a forum with sections available for viewing by visitors. One forum section available to the public is entitled “How much is my item worth.” There are also articles available to the public which have been written by members on cast iron cleaning and seasoning methods. You can also find a plethora of recipes for cast iron cooking.
The Griswold & Cast Iron Cookware Association is a group of cast iron and aluminum enthusiasts. I am also a dues-paying member of G&CICA. G&CICA also maintains a ewebsite with information and links to a lot of information about vintage cast iron collecting.
There is also a website established by a cast iron collector that has a ton of info on it; it’s worth checking out! Additionally, reddit has a sub-forum on cast iron, where folks often ask for and receive cast iron identification assistance. I also wrote a blog post about identifying unmarked cast iron, which you might find helpful.
A little googling on your part will turn up an abundance of information to get you started. Happy hunting!