Yeah... The M-250R had two labels stuck on top of each other. Fortunately I was able to peel them apart from one another. I reglued the bottom one back in (since it was the one that was visible all those years) and taped the second one up on display.
Yeah it's weird. The tags were stuck on top of each other too. At first I thought maybe they stuck the wrong label on so I unattached them and turns out they're identical labels. Notice how they left the primary volts blank and how confusing the wiring diagram is. Back then I don't think 240V with 120v PC receptacle was a standard offering so they probably didn't have tags for it. I've seen tags that say the fixture is 120X240V but that's also misleading since the ballast itself is just a 240V choke.
I was thinking that too but then I saw both tags had the exact same thing on them. I suppose they could have stamped 120V PC/240v BALLAST on the tag if there was more space.
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I suppose they could have stamped 120V PC/240v BALLAST on the tag if there was more space.