I ran across this posting on Facebook Marketplace for a 1979 Harley Davidson FLHP 1200 Electra Glide, former Colorado State Police motorcycle. The first thing that caught my attention was the the Grote model 7622 beacon mounted on the rear. I have seen my share of police motorcycles over the years and never seen one with such a large beacon on it. The listing mentions it has both a manual tire siren and an electronic siren, both on the left side in front of the saddle bag. I believe the black “police” cover is over the electronic siren speaker. I have to imagine this was not how it was when originally in police service. Perhaps the beacon and electronic siren were added later when it went into service as an escort motorcycle.