What springs to mind in cork is fota and mallow still have one of the pre blue signs each
A few stations from glounthaune to cobh have IE, IR and even CIE signs of trespass, footbridge and parking related nature. Cork car park has a CIE sign (and a GSWR Timber sign!)
As of right now. I believe there are two stations with complete all old signage. Cahir and one of the stations on the DSE