Friberg served in the Estonian Armed Forces during the 1940 occupation and was automatically considered a member of the Soviet Armed Forces, where he fought in Courland. In 1941, he was wounded, returning home in 1946. He then built boats for a couple of years and tried to fish to no avail. After that, Friberg lived in Norrby.
In 2014, he was congratulated on his 95th birthday.
- "OSKAR, 1919: Noortele inimestele oleks rohkem töökohti vaja muretseda" Delfi, 28. veebruar 2013
- "Oskar Friberg - vanim Vormsil elav rannarootslane" Eestielu, 16. märts 2011
- Lääne Elu, nr. 93, 16 aug. 2014