Cast iron seal of the City of New York, from the elevated West Side Highway (formerly Miller highway) This was the second design, for 1686, the second photo is of the original first design "1664"

There are more photos of the highway and iron work here My Message Board

These were all cast iron about 15 feet long. Up at the top center, the smaller piece with wings and an hourglass in it's center came home with me one day when the demolition people had this whole block long section of the side of this elevated highway laying flat on the pavement at ground level.

Came off with four bolts and weighed over 500 pounds! A photo of one is further down below.

The large panel below it, on the extreme right one can make out an Eagle's head facing right, tried to saw him off with a hacksaw but his neck was about 5" in diameter and was SOLID cast iron.

No wonder the highway collapsed, all the excess weight LOL