This 1956 Crown Tractor was built for the Santa Monica, CA Fire Department to pull the City's 1943 American La France 85 foot aerial..  The Crown replaced Santa Monica's 1943 American La France tractor.  I guess this makes it a "Crown La France"?  The rig was sold to Lynnwood, WA in 1968 where it operated as Truck 50 until 1983 when it was sold to a collector who is unknown at this time.  The Crown tractor carries serial number F1067 and was originally powered by a Hall-Scott 935 gasoline engine.  If anyone knows the whereabouts of this rig today, please contact me here.
Special thanks go to Matt Monson for sharing these photos with us!