UDDEHOLMS AKTIEBOLAG.

The flag is a blue swallowtail with a narrow white border except at the hoist, bearing a crown above yellow UB letters joined by a dash. Rosanoski interprets them as Uddeholms Bolag. Brown makes the dash distinct, while US Navy’s closer junction can look like joined UHB letters. Mitchell omits the dash and colours the crown’s inner base red, where the other sources retain the funnel or flag’s base colour.