Delicately Etched Vintage 1940s 1.5cm White Glass Heart Buttons

These lovely old glass buttons are in the shape of hearts, either 1.5cm or 1.8cm wide, and have a lovely delicate looped pattern etched around their edges - most unusual.

They have an integral glass shank on the back - see last photo.
There are 9 on their original shop cards or I have a few lots of 6 loose buttons.

(the last 2 photos are taken under electric light not daylight so look more creamy !)