Cut-leather Doilies

I have been doing some dusting, and was reminded how beautiful these cutwork leather doilies are. They are the work, in the 1930s or 1940s, of my late mother-in-law. They seem to be a design traced onto thin suede leather, outlined with a dark pencil or similar and then painted with oil paints.

The set is made up from the one oval and two smaller round doilies.

Does anyone know if this technique has a particular name????