Apologies for what was written below which proves that a little knowledge is a dangerous thing.
The FC signs are for fire cocks – similar to fire hydrants. The date relates to opening of Waterworks.
The insurance signs were different. One is located in Montenotte and two more in the city centre.
I have photographed what I think are all of the FC and old fire hydrant signs and will upload at some stage.
Apologies again – 20160208
I was delighted to recently get my hands on a booklet, A Guide to Cork City’s Historic Plaques and Signs. It has answers to a number of queries in my head as to the meaning of certain old signs - including the FC sign to indicate that the building was insured and so the privately operated Fire Brigade would be sure of payment in event of fire.
Thought provoking as to how the fire brigade now acts as a public service and they will deal with fire and then issue request for payment – not other way around. Imagine a fire in a building adjoining an insured premises, would the private fire brigade have left the uninsured building burn and have limited their work to stopping it spreading to the insured building.
Need to go gathering more information