Wallet Card at some vintage street signs

From the 1910's to the 1960's, NYC street signs were blue with the street name in white, with the cross street in a raised area on top. These were known as "humpback" or "camelback" signs. They are no longer in use anywhere in the city, but you can still find some slightly out of place, above the second-floor awning for the Press Box bar on Second Avenue between 49th and 50th streets.

If you zoom in on the picture below you can see one of them was for the intersection of 2nd and 49th and the other for 2nd and 28th.