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Jakob Frans Oskar Wasastjerna (1819–1889), known as Oskar Wasastjerna,^[1] was a Finnish soldier, civil servant, genealogist, historian, writer and member of the Wasastjerna family [fi].

Jakob Frans Oskar Wasastjerna was born on 15 October 1819 in Vähäkyrö (present-day, Vaasa) to Frans Didrik Wasastjerna and Hedvig Elisabet Banger.

In 1859, Wasastjerna was the district manager of the Eastern Customs District of Finland.^[1] In 1867, Wasastjerna was a customs officer of Porvoo.^[1]

Wasastjerna was married to Johanna Beata Nordenborg and Maria Margaretha Mether. Wasastjerna had five children, including Karl Oskar Wasastjerna (1853–1923) a captain, author and member of the Diet of Finland. On 21 February 1889, Wasastjerna died aged 69 in Porvoo.^[1]

• Tull-taxa för Storfurstendömet Finland å såväl import- som export-artiklar (1863)
• Ättar-taflor öfver den på Finlands riddarhus introducerade adeln (1880)
• Lifgardets finska skarpskyttebataljons officerare och civile tjenstemän (1887)

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