Large Antique Early 19th Century ‘Portrait of a Gentleman’

Large Antique Early 19th Century ‘Portrait of a Gentleman’ 
American? oil on canvas, sitting in a nice gilt frame, in good condition, some restoration is visible, appears to have been done by Augustus Rose, the piece remains in acceptable and attractive condition, nicely framed and ready to hang, unsigned. 
Dimensions Cm’s (including 
frame) 
WIDTH 72
HEIGHT 85