Help in assessing

[ksp]

Сообщение от Amateur

artist, possibly Dutch, like the flag on the ship.

Amateur, you're right, in the history of the paintings, indeed, is a Dutch "footprint". In the 19th century. sister of one of the residents of St. Petersburg was married to a resident of Holland. According to the stories and pictures from there.
I do not know whether the value that are arranged vertically rather than horizontally.