Set of four RCAF/RAF & military buttons

Three RCAF/RAF buttons:

1. 'RCAF'  / J.R. Gaunt & Son London  Front is worn, some lettering worn on back.
2. 'RCAF' / UNITED-CARR Canada      Loss of plating on front right side + letters.
3. (RAF - Crown & Dove) / Smith & Wright Ltd B'Ham  Some wear on front, some rust near lettering on back

One military button with 'Canada' and crown.