There were several combinations of an arched logo with various heat ring styles from 1910 through the 30's(from the RB). Looking at a Lodge list that has dates where certain products were cut, there is a set of 3, 5&8 hammered skillets indicated in ‘37. Lodge still would have been making the single notch skillet with arched logo then. The cut may not indicate that they stopped making all of the hammered skillet sizes indicated, but it does show they were making them at that time.