For the marked version, in excellent condition (already cleaned, no warp, no cracks, no pitting), $45 would not be unreasonable, say, at an antique store. (One would hope to be able to find a marked version for less at a flea market.) Collectors in-the-know, however, typically look to pick up a user piece such as this one for quite a bit less. The upside is that it's still a quality made piece of cast iron cookware from a time when skillets' cooking surfaces were still being polished smooth. The unmarked were typically of no lesser quality than the marked.