Follwed the breadcrums in Susan Dods' post, and found these.
Christies links seem to be pretty long-lasting, so hopefully these can be enjoyed for awhile.
http://www.christies.com/lotfinder/textiles-costume/a-group-of-ten-mandarin-hat-buttons-5048867-details.aspx?from=salesummary&pos=6&intObjectID=5048867&sid=f7bb9786-b209-4699-8098-9998f5cb7691&page=10&lid=1
http://www.christies.com/lotfinder/textiles-costume/a-group-of-eleven-mandarin-hat-5048862-details.aspx?from=salesummary&pos=1&intObjectID=5048862&sid=f7bb9786-b209-4699-8098-9998f5cb7691&page=10&lid=1
http://www.christies.com/lotfinder/textiles-costume/a-group-of-seven-hat-buttons-and-5048866-details.aspx?from=salesummary&pos=5&intObjectID=5048866&sid=f7bb9786-b209-4699-8098-9998f5cb7691&page=10&lid=1
Around the end of the 19th century, China began to incorporate the buttons into miniature bells for export. The button formed the handle above a two-inch tall porcelain-covered metal bell, which used a small glass bead on a chain as a clapper. Today both the buttons and the bells are collector's items.Source: Pitt Rivers Museum Body Arts | Mandarins' buttons