About
PRIMA bricks were made by Geas Konstharts in Gislaved, Sweden during the 1950s. In 1950 they first loaned tools and equipment to make Automatic Binding Bricks from LEGO. After that they made their own bricks known as PRIMA.
You can read more about Geas here: Sweden LEGO history
It is believed that the equipment from Geas and their PRIMA bricks were purchased and used to make BYGGIS. This is still being researched.
You can find a full overview of what bricks and colours exist for the PRIMA bricks here: PRIMA overview.