Maker / backmark - Jennens. Here is a nice original uniform button. Listed in good faith and to the best of my knowledge and abilities.
Army Button 15th York East Riding Regiment Of Foot 19 mm
Scottish Army Button 1st Dumbartonshire Rifle Volunteer Corps 1800's Gardiner
Scottish Army button Argyll Highland Rifles John Martin Dunoon
Scottish Army Button Renfrewshire Militia 1800's Firmin small 16 mm
Irish Army Button Connaught Rangers Elephant Hobson 23 mm
Irish Army Button Galway Militia 1793-1829 Jennens 16 mm
