The Harley H.O.G. pin was not produced by the Hard Rock Cafe. The Harley Owners Group had a monthly meeting at the London Hard Rock Cafe where they turned up with the Motorcycles and left this pin in lieu of a tip to their server. It is considered a Hard Rock collectible because the pin was made for, and only distributed at the London Hard Rock Cafe in the early 90's. (HRC Pin Collectors Guide) Painted style. print Smooth/Polished/Shiny Pattern. Back: Sand finished, This pin was only distributed to staff members. Base Material is Silver Appearance.