A collection of buttons, 19th/20th century

A collection of buttons, 19th/20th century, comprising: a group of Art Nouveau moulded glass buttons; a pair of openwork buttons set with yellow, pink and red pastes; a pair of mother of pearl buttons with gold and silver Rococo-inspired decorations; a pair of Satsuma ware buttons; and a pair of paste buttons simulating diamonds and malachite, largest 3.8cm diameter