Ha, that'd make that factory recall for Bending Units 7, 22, 48, 256-948*all the more funnier *Something like that, I can't quite remember them all...
Nah, I think Bender Rodriguez is
number 22 - though yeah, since he's also got such a different serial code, perhaps the term only refers to his home factory in Mexico. Or his mommy? Perhaps he is only the 22nd Bending Unit they/she made, and they'll call him that when they want to talk to him personally, and perhaps he's proud of that, s'why he may use Bendering Unit 22 elsewhere.
I don't know, I've dragged on a bit haven't I...?
Basically the thing I was
going to say that while I don't think it was Bender, or one of his class, let's remember that the first robot Farnsworth perfected suspiciously looked like a Bender. So there's probably been several Bender looking robots down the years.