I consulted my colleague Mr Keith Miller who has reliably informed me that the sword is a Mameluke, carried by General Officers and Bandmasters; General Officers swords had crossed baton and sword on the hilt, as this is not present in this image it confirms that the Gentleman was a Bandmaster."
The curator suggested that I contact the Royal Green Jackets Museum, which I did, but I never received a response.
My father's shop is now closed, and the painting sold long ago, but my curiosity remains. The only images I have are those I harvested from the old SFI thread linked above. I am curious if members agree with the NAM's attribution or if there may be any further suggestions.
Thank you,
Jonathan
Some possibly useful information:
--The description from the previous owner of the painting; "Portrait of a Band Sergeant, possibly Rifle Regiment, seated half length, wearing uniform and holding a mameluke hilted sword. The medals are The Crimea Medal with three bars for Alma, Inkerman and Sebastopol, and the Turkish Crimea Medal. Original frame."
--The shako plate appeared to depict a panoply of musical instruments.
--The epaulette has a number 2 on it.
--Photos (I am not able to provide additional or larger images):


Shako:

Shako:

Epaulette:

And a sense of the scale of the painting:


