NYC exploration never fails to surprise. I had just emerged from lunch at Zeke’s Roast Beef, once a weekly trip when I lived in Bay Ridge (Zeke’s was at 8th and 66th for most of my time here and, after a few years’ hiatus, reemerged at 3rd and 78th). Seeing a brick front building that looked to be of a certain age, my instincts told me to look up and, sure enough, there were the two cross streets stamped into brick on the corner.
Look at the great attention to detail in this corner sign. Periods after the abbreviations, and rules under the RD and the TH. Before cities regularly posted street signs this was the usual method of street identification and to this day, London, UK still identifies streets by signs attached to buildings, usually not on utility posts.