We have 3 red buttons, vintage items.  They are plastic with back shanks.  They measure about 1" in H x about 7/8" in W x about 1/2" in D.  The "berry" (the top looks like berries to me....) top have different appearances to them with some having a shiny appearance and some being the dull plastic.  I would say these are in fair condition.

3 Red Buttons Vintage Items

$9.95Price