Here is a Google Streetview of an old school Suffolk Transit sign. Interestingly it is blank, I have no idea why that it. This sign is located on Southbound NYS 454 1000 feet from Lincoln Ave.
Old Suffolk Transit Sign by mws5689, on Flickr
It is also the only other old style Suffolk Transit Sign I know that exists as of Oct, 2016. The other one is located near an entrence to NYIT's Central Islip Campus on Gullhaven Dr across the street from the Central Islip Town Center on Carleton Ave.
Old Suffolk Transit stop Sign by mws5689, on Flickr