On January 20, 1999 Latvia issued this 2 santims value as a part of its Municipal Coats of Arms series. Stamp shows the arms of Auce, dominated by a large crayfish. Auce is a village (pop. 2244) in Zemgale, in the southwest of the country near the border with Lithuania.
From heraldry-wiki.com, "The arms show a crayfish, symbolizing that the rivers around Auce were rich with crayfishes."