Unusual Blue Green 2.2cm or 1.7cm Vintage French Buttons - 6 or 24

A most unusual blue green colour - like the sea in a fairy tale
Interesting design  too- a fluted circumference and holes cut out to show the colour of the fabric underneath.
I have them in 2.2cm wide or 1.7cm wide, French, 1940s and I'm selling them in lots of 6 or sheets of 24.
The last photo shows the back of various colours of these buttons.