Star above NEDERL INDIE:, date below (1839) and mintmark "J" / Crowned States General arms dividing the value (1-Ct). 21mm, 2.95 grams. Krause #290
The denomination on this type is given as "cent", but these coins were equal to "1 duit" and were worth 1/96th of a silver guilder, so (despite their name) they are not true decimal coins.
These coins were minted in the Netherlands for circulation in the Dutch East Indies (modern Indonesia)