Keystone Rare Coins Inc Contact Information Address: 3029 College Heights Blvd, Allentown, Pennsylvania 18104.0 Get Directions About Last Update : . Price : Keystone Rare Coins Inc is located at 3029 College Heights Blvd,Allentown,PA 18104 Loading... No Records Found Sorry, no records were found. Please adjust your search criteria and try again. Maps failed to load Sorry, unable to load the Maps API. Claim Listing Recently Viewed: Loading... Next