18thC gentleman

Unknown gentleman, 18th century, oil on canvas 74.5 x 62 cm. Presented by Claude Dickason Rotch, September 1953. © Government Art Collection (2299)
Thoughts regarding the possible sitter or artist of this portrait in the UK Government Art Collection would be appreciated. Please use the ‘add a comment’ facility below.
Zoom in on this picture on the GAC website.
Comments
I would strongly suggest an attribution of Sir Allan Ramsay, for the 18th century portrait of a gentleman. It bears strong similarities to his portrait of Ralph Sneyd in both costume and posture of sitter, colouring and handling, which would suggest a dating of circa 1753.
The Ralph Sneyd portrait may be seen at Philip Mould’s Historical Portraits Image Library:
http://www.historicalportraits.com/Gallery.asp?Page=Item&ItemID=1061&Desc=Mr-Sneyd-%7C-Allan-Ramsay