I also have been slowly collecting a set of Wapak Indian Head cast iron. Wapak cast iron might be lesser known compared to the Griswold and Wagner brands, but it is just as collectible. The most sought after Wapak cast iron are the pans with the “Indian head medallion” on them, which was produced from 1903-1926. The most collectible is the #4 skillet. The rarest was thought to be the #5 skillet--until recently. A #2 Indian Head skillet, a one-of-a-kind skillet, not previously known to exist, surfaced on eBay in July of 2020 and sold for more than $10,000!