Star above INDIAE BATAV:, date below (1820) / Crowned States General arms dividing the value (5-1/16). 21mm, 2.97 grams. Krause #282.1
The denomination as listed on these coins (5-1/16) is equal to 1 duit, but is not easily understood - it is interpreted as "5 of these pieces equal to 1/16 of a silver guilder".
The Batavian Republic, was the successor of the Republic of the United Netherlands. It was proclaimed on 19 January 1795, and ended on 5 June 1806, with the accession of Louis I to the throne of Holland.