Here is a shot of one of my favorite groups, light and dark teals. With the exception of the top right signal, I believe all are Ohio Brass products. The three signals in the middle are unmarked, all of the rest have the O-B marking. I believe the top right piece was made by New Lexington, as the color is quite similar to the M-2636 I have. I am wondering what other examples of these are out there? I have seen an O-B cable something like a U-512, have yet to see another. Top row: U-625B, U-448, U-274A Middle Row: U-301, U-298,U-257, U-447 Bottom: U-634A, U-448,U629A,U-320