New York City street corner signs (1920s)

These are vintage porcelain "humpback" street signs that retired from Manhattan in New York. My first sign of this type, as shown on the left, I acquired several years. Recently, I found its twin. I cannot say for sure if these two were once together, since a minimum requirement of 4 signs were to be used at a New York City intersection in the old days. Though the recent find is great, since I now have a street corner with the right street names.