Very new to cast iron and came across a gated piece at a local antique store. I thought this might be an SMS with the given handle design however the heat ring has notches. Notches are evenly spaced from each other just left of 6 ol clock and another notch is nearly at 12 ol clock. Anyone come across something like this? I couldn’t see the notches when I bought it. I discovered them after stripping the skillet down. I think it’s neat but am perplexed now.