Those who worked in North Bay's famous Underground Complex ("The Hole") were part of the Brotherhood of Underground Mushroomers and received mushroom pins like these!
 
-1/2" brass pin with brown enamel paint
-Created in 2006 for commemoration of closure of the Underground Complex
-Identical shape and design to original pins, which were brass only
-Presented on 'Brotherhood of Underground Mushroomers' card