Brave Fine Art has dated this piece to the 19th Century.
It’s unusual to find an address on a letter within a portrait so presumably the sitter requested that this be included.

There are various lines of noble Beaufort families, so perhaps it was seen as prestigious to have links with French nobility. It’s an intriguing mystery.
The portrait is housed within a later gilded frame with attractive foliate borders.

Medium: Oil on canvas
Overall size: 29½” x 35½” / 75cm x 90cm
Year of creation: c. 1815
Provenance: Denmark
Condition: Craquelure throughout. Repairs to the canvas. A slit in the lower left. Paint losses - mainly in the lower right. Frame with minor losses.
Brave Fine Art has dated this piece to the 19th Century.
Exquisite antique paintings that capture the imagination.
You can view the stock and full dealer information on the Brave Fine Art Profile Page