The picture below shows larger front and back views of this Old Unused Hopalong Cassidy Cowboy Character Linton Dairy Wilmington Ohio Milk Bottle Cap. The cap is not dated but it is believed to be from the early 1950s. This is a small cardboardmilk bottle cap that probably went on a one pint milk bottle. The cardboardmilkcap pictures William Boyd as Hopalong Cassidy, and it is marked as follows: