KM# 85.1: CES with 2 lines (1920-1929) KM# 85.2: CES with 1 full line and one partial line (1920-1921)
85.2 error of a filled die?
Maybe, but ask yourself why did SCWC think that variety only occurred on 1920 and 1921 coins and not on coins from the other 6 years and never on coins from the 10 years on KM86 coins? I'd assume there would have to be enough with the same partial line that could only happen with a true die variety.