Wigs on the Green has dated this piece to the 18th Century.
This label has also been recorded on a miniature portrait.

Indeed Thomson is better known for painting portrait miniatures. Born in Georgia, USA around 1771, he moved to Edinburgh with his family following the American Revolution. He exhibited miniatures from 1795 but did not enter the Royal Academy Schools until 1808. Married to a Scottish lady, he subsequently returned to Edinburgh becoming a member of the RSA. He is said to have declined the honour of a knighthood.
Size: 33 x 25mm
Provenance: Acquired for the Christie Collection in 1937 from ‘Polly’ Perkins
Literature: McKechnie p.691, illus. p.703
APHA Registration: 7Q47HVA9
Wigs on the Green has dated this piece to the 18th Century.
Small portraiture of character & historical interest
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