It's a GE Powerflood PF-1000. Newer design. Model would be PF1K-01-S-0-A-1-???-GR-K
The ??? is the optical pattern. I can't tell which is which. 01 is the lamp wattage. S is HPS. 0 is multitap ballast. A is Autoreg (only ballast available). 1 is PC or the lack of it. GR is grey the color of the fixture. K is the knuckle Slipfitter for 1.9"~2.38" pipe.
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The ??? is the optical pattern. I can't tell which is which. 01 is the lamp wattage. S is HPS. 0 is multitap ballast. A is Autoreg (only ballast available). 1 is PC or the lack of it. GR is grey the color of the fixture. K is the knuckle Slipfitter for 1.9"~2.38" pipe.