Nice! A GE Powr/Bracket fixture. Cant really tell by the pics but if the paint is silver, the light is an original from before 1966. If gray its post 1966. If you open it (unclip the bucket and loosen the screw on the bottom of the door, the door will hinge open) there will be a date code on the nameplate. If the nameplate is unreadable the capacitor will have the date stamped (week and year).

The date code says 1971 but the rest is unreadable

Very nice find!

Looks like 175W Powerbracket for me.

Definitely 400w mv.

Very nice, my favorite, a 400 MV. It have the Astrodome photocell too!

That looks like a shorting cap installed on a standard PC socket. I'd love to get a 175w mv version with the Astrodome PC.

Very nice Powr/Bracket ! I have a PC just like that somewhere (it's a home repo/blowes special like usually comes with some of the lower quality yard blasters those aren't overly reliable. There are actually several places to look for the date on your particular fixture, 1+2) as streetlight98 said, date and year on capacitor and date code on I.D. tag on ballast module , 3) the only other place is (on mine anyway)with the optical assembly removed right next to the socket there is also a info label. While you have the optical ass'y removed, check the wires going to the socket as both of mine are very brittle with crumbling insulation .

Again, AWESOME FIND !!!

Interesting, I never find anything like this at antique stores. Very cool find!!!

Nice light! I've seen vintage MV and incandescent streetlights occasionally at antique stores around here. In fact a few of the older streetlights in my collection were from antique stores. Haven't seen a GE PowrBracket but I've seen a 175w Sylvania bracket fixture and a NOS Cooper 400w MV Vanguard at a Restore once.

Maybe I'll try to get one, thats 100w or 150w HPS.