Lot old buttermakers "Coupelles"

Lot of 10 old butter cups (well it seems to me...) in good condition (except 2 that are chipped, see photo). They're all different. Diameter: 10.5 cm. Height: 5 cm. Some cups have cracks in the bottom, others do not, there, I have no explanation The wear and tear of time can be because I have hardly ever used them. They are used more as decorations.