Given the performance of the W&KR the fake might be worth more than an original! If I wanted a mocked up sign I would go for something like the GS&WR, the only reason I can think of for choosing an obscure outfit like this is to add authenticity.
Although I don't recall seeing it before, historic streetview images have present it in 2010. Were it not for the cross head screws I would have made a case that they might have had a yard in Tullamore to hold goods from the DE Williams brewery before moving them by road, rail or canal to Mountmellick/Portlaoise for rail transit to the port of Waterford.