Brave Fine Art has dated this piece to the 1920s.
It's interesting that he's holding a green book as perhaps this is a clue as to his profession. Or maybe it simply signifies that he’s a keen reader.

The portrait is housed within a beautiful gilt foliate frame with corner ornamentation.
Medium: Oil on canvas
Size including frame: 21” x 18½” / 53cm x 47cm
Year of creation: c. 1920
Condition: Artwork with areas of craquelure and minor scuffs around the periphery. Frame with light abrasions.
Brave Fine Art has dated this piece to the 1920s.
Exquisite antique paintings that capture the imagination.
You can view the stock and full dealer information on the Brave Fine Art Profile Page