Crouse Hinds Type M fixed 4-way. It came wired for a three circuit controller which meant that the signal only had three circuits. Main St. red was wired to cross street green. Main street green was wired to cross street red. All 4 yellows were wired together. The green stayed lit during yellow, and the signal displayed yellow when changing from green to red as well as from red to green.
The Type M followed the more traditional looking DT. Some of the early post mounted controllers were only 3 circuit controllers and they often outlasted the signals out on the span wire, so this signal probably went in service in the 1960s and replaced a WW-II or earlier vintage signal.
Well I knew the DT was before. I just meant the controller type may have been because of an older light there...like a Darley I don't know of any Crouse Hinds controllers that did the overlap
I post some of the explanations for those reading this thread that aren't familiar with the evolution of the various models. Three circuit controllers were more common for on-board use since they took up less space, but in the 40s and 50s there were a lot of 3 circuit post mounted controllers too. Remember back then nearly all transmissions were manual. Some jurisdictions required putting stickshifts in neutral when standing at a red light. The yellow before green meant "get it in gear." I remember a lot of those as a kid in the 50s.
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