Again, to date we can not say with certainty whether this button was an Irish Volunteer or Irish army issue. However, it has the earlier broad harp with eight harp strings.
The button is 26mms in diameter, made of brass, it is an other ranks type button. It has the “J IRELAND & SON Ltd.”
nmae on reverse. Not many Irish Army/IV buttons are noted with this outfitters name on the button reverse.