This geiger counter was manufactured by Technical Associates of Burbank California. The F-6 model was first produced in 1955 as a weatherproof portable piece for prospectors.
This particular geiger counter was probably used for exactly that, as it was found at the top of Last Mountain, near an area of double the normal background radiation around Peachland.
The electronics are all vacuum tube based so it requires a very high powered battery to operate. Two 67.5 volt batteries must be wired in tandem, for a voltage greater than what comes out of a wall outlet! After six decades this historic piece of equipment and legacy of the nuclear age appears to be almost operational. An electrical fault somewhere in the system causes it to register extreme amounts of radiation whenever it is turned on!