Yeah, I have one too...both mine and Dave's dates to 1957.....There was three of them in service near me just roughly 5 miles away from me....until recently...now there is only 2 of them left near me....one disappeared, replaced with a GE M-250R2 HPS with sag lens...I wonder what happened......hopefully a case of a hungry lineman collector
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those OV-14B are pretty much the VERY first low wattage cobraheads ever made!
While I had 3 of them in my house.....one of them had slightly different design....such as different bolts, and the "Westinghouse Type OV-14B" had a different style font....
UPDATE: I saw this OV14B lit up last night. Still works, but it will need a new bulb before long, the /DX mercury bulb is slightly dimmed. Appears to be 175w just like mine. Fortunately Progress Energy Florida appears to still maintain mercs, even though they are relatively few in number.
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those OV-14B are pretty much the VERY first low wattage cobraheads ever made!