The lid was made for the Norwegian rock band "THE DOGS" and can be purchased on the bands website.
Please note that the outer ring was made by a different manufacturer.
GJS-500-7 also called GGG50 marks a strong and heat-resistant type of metal while GJS is a sign for Continuously Cast Spheroidal Graphite Iron - which describes a process in which the metal is continuously fed.
Photographer’s Note: Merch from the band "The Dogs" made by ulefoss. can be bought at their concerts.