These ‘humpback’ navy and white street signs were standard issue in Manhattan and the Bronx from 1913 until the early 1960s. Politically, Manhattan and the Bronx were the same county until 1914.
This intersection no longer exists, as East 177th was replaced by the Cross-Bronx Expressway in the 1950s.
C.L. Croes was a 19th Century NYC civil engineer.