I have for sale a pin back from The Regina SK Exhibition here in Canada. I don't know what year this one is from and is very good shape. The Regina Exhibition was called Buffalo Days for as long as I can remember and that is a long time! They now call it Queen City EX so there will be no more of these made. It is 2 1/8" wide. On the bottom edge it has printed acme novelty regina - made in canada. The shine on the buffalo's head is mostly camera flash but there is a Smaller spot on it. Please visit my Store for more new and used items to see. I will happily combine purchases paid together within a 7 day period. Thanks 5% Goods and Service Sales tax is required within Canada.