E. F. Johnson Beverage Coasters. Material: metal, cork. Size: 3 3/4" diameter. Description: (a) polished matte steel or pewter plate with raised edges; center stamped Viking logo in darker gray and "EF Johnson 70 Years in Electronic Components". (b) polished matte steel or pewter plate with raised edge; darker gray center stamped Viking logo encircled with darker gray background stamped "EF Johnson years in Electronic Components"; both coasters are bottom lined with cork.