Austrian Tinies are very small metal buttons with other materials like velvet, celluloid and pearl used in their design. They are always under 1 cm in diameter. The back is domed and japanned (layers of black paint) and has a metal loop shank.
As the name suggests they were mainly made in Austria.
To have so much detail in such a small button is wonderful. Lots of them have tinted metal and have several layers in their making. They were made in the late 19th and early 20th Century.