Portrait of a man in suit

Oskar Nick (19th-20th).
Oil on canvas mounted on panel, located (in Vienna, Austria) and signed lower right, dated and annotated on the reverse.
Period: November 1946.
Format: 44.8 cm x 34.8 cm (17.6 in x 13.7 in).
Marks of an old frame on the perimeter (see photos).