Picked up this 1977 Sonic “Butterfly” pinball machine on Vancouver Island. The playfields and backglass on Sonic machines are usually in pretty good shape. The downside are their terrible pressboard cabinets. Any water or moisture and the cabinets turn to the consistency of canned tuna fish. This particular machine had this problem with the lower section of the backbox. It sort of crumbled away. It has since been repaired with proper plywood.