Mexican motif sandwich plate

"Casa Uno Ceramics by Home and Giftware.  Designed in Italy, Manufactured in Sri Lanka.  Lead & Cadmium free, Dishwashwer & Microwave Proof".

I'm a little bit of a sucker for sombreros.  I think I purchased this in an op shop in Moonee Ponds.  Age?  Post microwave oven era.