"Found while metal detecting near an abandoned gold mine circa 1850 in Pike national forest in Colorado"
A: "This is a pre-1911 Chinese coin. Or at least, it’s designed based on a Ming era coin referred to as a Yongle Tongbao 永樂通寶. Yongle is the name of a Ming era emperor who died in 1424 and Tongbao refers to a type of coin with a hole in it. These coins had different denominations based on their material (silver, bronze, copper) and weight."
They also used to have firing ports in the billboards along the highways.
Ha my thought initially but realized it is being used to cover a hole...(Probably a location for a control panel in a different situation), since it fits so well
We have these in our elevators as well. There used to be a telephone mounted there to call the front desk in case the thing got stuck. Later they got obsolete because there had to be automated warning systems
This is part of the weather station system. There is also a wind speedometer above the plaque. And I confirm that the upper temperature is air temperature and the lower temperature is the road. Warnings, for example about black ice, are also displayed there