Shown in the scan are printing errors on the following stamps. Whether they are miscellaneous fly specks or true printing variants will depend on collector verification. Scott 238, 3R: white spot under nose. Scott 239, 4R:missing upper right ear. Scott 240, 5R: blue dots to right of 2, botton of first C, top of second C, bottom of loop of P. 241A, 5R:narrow bottom of 9, top of 2.
I went through all my sheets/panes of 4 Rub stamps and did not find this specific flyspec. I got couple “broken left ears”, but they “broken” in different way, not like the one at the beginning of this thread.