These buttons are (left to right, top to bottom): Royal Munster Fusiliers, Royal Irish Rifles (I think), Leinster Regiment, Royal Irish Fusiliers, Dublin Fusiliers (QVC), Royal Irish Rifles (blackened version). This is a nice selection, including three of the units which were disbanded in 1922. Makers are variously Pitt, Gaunt, Firmin & Jennens.

These buttons (each just under 1.5cm) are single-piece officer buttons as on the bum freezer uniform jacket worn by this elite unit. They are made of gilt brass, have the king's crown, and are maker marked Firmin & Sons on the reverse. They are in good condition and have all their original gilt finish.