B&M Model MC Friction Drive Siren
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
Thanks to Paul Linn for sending me these photos. Paul received these files from Brian at B&M Siren. B&M Siren sells parts and restores old sirens. Also thanks to Keri Higgins for the additional photos of her restored siren.