They are trademarks, mandatory under Italian law, that every goldsmith manufacturer must mark his product in order to put it on the market.
One is legal purity and each precious metal has its own specific identification mark such as size and design (a lozenge, an oval, etc.).
The other is the recognition mark of the actual manufacturer, in fact OROvilla, division of the 8853 S.p.A. group, is 1748MI.
In addition to these two brands, further commercial brands are admitted, such as, for example, our MARIO VILLA logo, a symbol of guarantee for over 60 years on the Italian market.