Not hard to identify but still occasionally mixed up with Northwood's Star of David and Bows. This one has Imperial's Arcs pattern on the reverse which can be seen through this ruffled bowl. These are invariably ruffled like this one but, unusual for Imperial, they vary widely in the quality of iridescence.
Hartung Book One: Star of David
Bowls, 8-9 inches
Updated 9/1/2022
Hartung Book One: Arcs back pattern
Green, 25, 35 (both 2019), 15 (2021), 30 (2021)
Helios green, 15 (2016), 20, 30 (both 2022)
Marigold, 45 (2018), 45 (2019), 35 (2020)
Purple, 40, 50, 60, 65, 70, 85, 95, 155, 185, 200, 275 (all 2021),
70, 90, 95, 100, 110, 120, 150 (all 2022)
Smoke reported