YeaPolska is correct. Even if this were a plate flaw (constantly recurring variety) which it is not, the value would only be a couple of dollars.
For example, the Schueler book lists plate flaws for 27 of the 100 positions of Danzig Mi. #125. How many of these plate flaws does Michel list? The answer is zero. Michel lists very, very few of the plate flaws of these 1920's Danzig stamps. The printings are somewhat crude and there are many plate flaws and freak printings from these issues.
Of course, you will see people trying to sell these "rare" varieties on
ebay for big bucks. Danzig is a popular collecting area.