Aderia Glass are a very old company, originally started in 1819 to produce glass bottles and fishing floats. The company has been through many changes and relationships since and is now part of the Ishizuka Group, which includes Hokuyo, Narumi and Tsugaru Vidro.
Aderia Glass these days is produced from the Hokuyo Glass factory in Aichi Prefecture.
The Aderia Glass part of Ishizuka continues to produce the type of products they were founded on: blow moulded glass for domestic and commercial use.
These little covered bowls are from about the 1970s. They have been blow moulded and then printed.