His regiment can be identified by examining his shoulder plate. The number 77 was highlighted on it by the daguerreian colourist (likely Sarony's tint artist Edward Lancaster). The plate itself is made of gilt brass with a high silver relief emblem showing a wreath with central double digit numbers (77) with the Prince of Wales plume or crown top centre (all consistent with the 77th's known shoulder plate of the period).
Further evidence identifying the 77th East Middlesex Regiment of Foot are the tinted yellow facings on the cuffs (the known regimental colour for the 77th).
The shoulder wings and method of tying his sash signify that he was a member of the light company. He was likely a junior officer judging by his uniform.
