At this period in military history there are styles repeated throughout European armies so it is rather difficult to ascertain the officer’s origins. There isn’t sufficient detail in the uniform to identify a unit; though cleaning and further research may prove fruitful. The main coat buttons are plain, which suggests European, as all British regiments either of the line or militia are decorated with a regimental device or royal cypher. The double facing on the jacket and fine wire on the epaulette is also more akin to a European style with the scale type epaulette and mask button fastening and blank tunic buttons all point to a continental officer, but with no further details that could point to an origin anywhere from Russia to Poland as many units wore similar tunic patterns.
Despite being unsure on origin this is still very much the kind of picture we are always looking for, un-meddled with and with that discerning look that is hard to pin down; not to mention, it is a work that merits further research.
With thanks to Johnny Williamson and Paul Laidlaw