This is mere conjecture on my part, but does not the raised number, in this case the "9" indicate very early Lodge, or even Lodge's precursor, Blacklock, or was that the norm for that timeframe, (the early 1900's)? Over the years that I have been into CI collecting and refurbishing, I have acquired several pieces with the raised size indicator, and no other markings. I have a #8 pot with a raised number 8" and an external heat ring that the lid from my flat bottomed pot fits perfectly. The lid is marked FBP D and has the tab on top with the hole to lift it with the cast iron hook that just happened to be in the FBP when I purchased the pot and lid. Cheryl, am I way out in left field with this theory, or could there be some validity to it?