The date stamp is blurred on the back -- this is from either 1967 or 1987. I'm betting 1967.
The original cutline: Two new motorcycles recently purchased by the Overland Park police department are being used in daylight hours on selective traffic enforcement. The vehicles, manned by Patrolman George A. Riley (left) and C.W. Sundbye, will be dispatched to traffic trouble spots throughout the city. The motorcycles, because of size and maneuverability, are more effective in congested areas than patrol cars.