Livery buttons often had family crests & were worn by menservants of the 18th and 19th century. Most of those pictured here were made by Firmin & Sons, London.
Porcelain stud buttons were often sold blank & ladies could paint them at home to wear & exchange with friends.
A couple of interesting buttons with inanimate objects that have crossed paths with me recently. An artist palette, 3D dice, an enamel button with a vase & cut steel nails over faux wood planks.
Salesman's cards would often have variations of the same button for buyers to choose from. These black glass buttons have differing tints.
Twinkle buttons have a reflective inner layer that shines through cut outs in the top of the design.