Danish mailman’s visor cap
As late as 1979, you could still find mailmen wearing this cap along with a lovely red uniform. Then someone got the bright idea to replace the traditional double-breasted jacket with a strange red polyester leisure suit. Thankfully, these tacky uniforms were replaced not long ago with slightly nicer khaki work clothes with a small Danish postal patch. Alas, caps, though available to letter carriers, are rarely seen anymore. This particular style was introduced in 1950 and continued with minor modifications until the late seventies.