These buttons are new to my collection. I previously only had 3 or 4 perfume buttons.
These are all fairly small buttons ( mostly under 1 1/2 cm in diameter), being metal with some fabric (usually velvet) incorporated in their design. The ladies would put some perfume on to the fabric to make them smell nice and also not to run the risk of staining their clothes.
Stories have been told that during the Civil War, ladies would remove a button and give to their loved one going to war as a reminder of them. The soldier would keep it in his pocket.