Brass buttons are quite common, however some exquisite Art Nouveau buttons were made in brass and are very collectible. Some are quite valuable. Fairies and nymphs are particularly desirable.
Below are some examples and price guides of Art Nouveau brass buttons including a button with a fairy painting a peacock and a large winged angel button.
Circular button of cast brass with loop. It is decorated with an art nouveau type design of dragonflies in silver metal open work enhanced with polished steel.
Reference: © Victoria and Albert Museum
An extra large brass button with a large winged Angel. This exquisite button in the Art Nouveau style is truly stunning
Sold for $325 at Lion and Unicorn in 2020
FAIRY PAINTING a PEACOCK BUTTON. Large 1-piece stamped brass Art Nouveau relief of seated fairy with paintbrush and palette coloring a peacock perched on a column.
Sold for $200 at Charles A. Whitaker Auction Co in 2010