Innitials JG (DUTCH OR ENGLISH) original oil on canvas 19th Century

The detail of this painting is exquisite, This is a museum quality painting Initialed lower left corner "JG" the initials are on top of each other.The letter J is at the bottom And G on top. it is difficult to photograph. A curator that retired from the Los Angeles County museum of art physically viewed this painting. but could not determine who the artist was. Sotheby's Los Angeles was in transition of moving to New York, and did not have the available research time to authenticate this painting. I did not continue with the research.