To me they look like marksman's buttons. Based on my believe that he wears a 1884-pattern blouse, I am going with "Blunt" marksman's buttons, but if anyone can see the older "Laidley" marksman's buttons I would not disagree too much. For those who do not know 1885 Blunt marksman's buttons have oval target circles and 1880 Laidley marksman's buttons have round target circles.