The first button is a deep rich red square button of some type of plastic. It is a little over 4 cm and has a brass loop shank. The colour is much richer in reality.
The second one is a chunky moulded type of plastic in a real water melon colour which is eye catching. It measures 3 1/2cm and I show the grooved sew through shank at the back.
I do not know the age of these buttons but they are both fascinating in their own way.