The "Who is who?" publication "Vem är vem? Stor-Stockholm 1962" gives the following info on Per Wiktor Widengren:
WIDENGREN, PER WIKTOR,
direktör, Sthlm, f i V Vingåker, Södermani l, 14/1/09 av grosshandl Per W o Wahlborg Öfverman. Textil- o konfektionsstud USA 28-29, Tyskl 30-31, verkst dir ab L & P Widengren Vingåker sed 32 (styr:led). -Delt sv o internat biltävl, vunnit finska Grand prix 32, Rämenloppet 33, polska Grand prix 34. - Hobbies: golf, bridge. Gift 45 m Brita Bredberg f 13, dtr t dir Bror B o Ebba Lindholm. - Barn: Per Viktor f 45, Lars f 47, Tomas f 49, Henrik f 52, Lennart f 54.
http://runeberg.org/vemarvem/sthlm62/1418.html
Which translates into something like:
Widengren, Per Wiktor,
Managing director, Stockholm. Born in Vingåker, county of Södermanland 14 januari 1909, as son of wholesale businessman Per W and wife Wahlborg Öfverman. Studies in textile and prêt-à-porter in USA 1928-29, Germany 1930-31, managing director in the company "AB L & P Widengren" in Vingåker since 1932. Has partcipated in Swedish and international car racing, won Finnish Grand Prix 1932, Rämen Race 1933, Polish Grand Prix 1934. Hobbies: golf and bridge. In 1932 married Brita Bredberg (born 1913, daughter to director Bror B and wife Ebba Lindholm. Children: Per Viktor (born 1945), Lars (born 1947), Tomas (born 1949), Henrik (born 1952) and Lennart (born 1954).
A search at gravar.se reveals that Widengren died 25 april 1976 in Austria and lies buried at a graveyard called Båstad Nya Kyrkogård.
http://gravar.se/B%C3%A5stad-%C3%96stra ... 0Widengren
