M40 - 5.5x4.2cm filigree oval in Silver (1950s)

This filigree disc is not flat but is a slightly rounded oval. It was made in the 1950s in the Czech Republic. The oval shape measures approximately 5.5cm by 4.2cm and is silver in colour. It is very light weight and is made of metal (not metal coated plastic). The disc has 12 teeth around the centre which could hold a stone about 3cm x 2.3cm x 0.5cm in size.