Here is a huge silvertone pendant in the machine age, brutalist style by the Danish company using the initials J.E.B. I think this may represent John Erik Boolsen, Copenhagen, 1961 -84. Numerous rings have been piled up onto the square plate - looking like the discard from a mechanics workshop.
The pendant has an integral chain
Marks: JEB Denmark
Size: The pendant measures 2.52 ( 6.5cm) x 2.2" (5.8cm). The chain is 28" (72cm)