I've been noticing these over the past while. Here on the Ards Peninsula two are in Cloughey (pink and brown) and one in Millisle (green). There's a more elaborate one in St Johnstown in Donegal with a lion's head. Glenfield & Kennedy were a huge firm in Kilmarnock in Ayrshire, selling products around the world. It seems that they were suppliers to local authorities in Ulster, and Ireland as a whole.