I believe it was from a country in Southeast Asia. I often used the larger one, so there are crack-like lines on the inside, but none on the surface, so I think it's probably staining in the craquelure (photos 3 and 4). The others are in good condition. Craquelure present. A set of 5 pieces in different sizes. Approximate sizes: 12 x 6 cm, 2 pieces 10 x 5 cm, 3 pieces #BatTrang #Vietnam