I thought I would post this vintage piece of equipment I pulled out of a friends house just before Christmas. when it was removed the fixture DID operate! If you notice on the sticker it was also made right here in this very same city I live in as well.
Didn't the Pensylvania (spelling?) Railroad use 11000VAC 25Hz for powering those big GG-1 electric locomotives? There was a steel mill that also used 25 Hz supply for the equipment (the name Bethlehem rings a bell-on the eastern side of the U.S.)
Sir Adam Beck in Niagara Falls still has 25 cycle generators. They have several industrial customers on both sides of the border that use it. I think they are trying to phase it out by not renewing the contracts as they expire.
If you do a search on frequency, 25Hz etc. you'll find several threads where we've discussed the use of 25Hz in the past, and the fact that a few places in the U.S. once used 50Hz (e.g. Los Angeles area up until the 1930s).
One other thing I note about that ballast is the nominal voltage rating: 118V instead of the more usual 117V.