Thanks much to all of you who commented. I feel much better now. The funky numbers on the axle had me wondering if I had been taken 20 years ago when I bought this thing. I obviously didn't know enough about Danas back then to ask the right questions, and those numbers, especially the lack of the usual BOM numbers, gave me concern in the here and now. But now that I've cracked it open, and you guys have confirmed it's the real deal, well, all is good now.

Thanks again.