This is Keystone’s smallest fire station with a base that is only 5.75″ by 11.5″. There is a siren that sounds when the handle is turned on the right of the building. To the left is a reservoir with a hydrant. the hose from the truck is attached to the hose from the hydrant and the water is pumped into the truck. This set appears in the 1950 catalog.
From my private collection.