One of these stamps is a genuine stamp and the other(s) is a forgery. Can you tell the difference? If you are having trouble, see the "hints" and answer below.
Belgium Scott# B25-27 All genuine stamps have 3 ½ pearls next to the value tablets and measure around 22 ½ mm in height. Forgeries measure around 22 mm in height, with the most common type has only 3 pearls.