It has to be two different keyboards. '120s had no lock lights because the terminal emulators they were used with showed the lock status onscreen (a holdover from the days before keyboard-based lock lights).
You see listings like this regularly, where the title has one p/n and the photos another. The seller may think, "I already have a photo of the front of a Model M, and they all look the same, so why bother taking another?" Sometimes
all the photos are of a different board. Either the seller no one cares about such details, or they just don't want to bother.
Another discrepancy you often see is between an auction's title and its description.
Here, for example, someone's listed an "IBM Wired Keyboard" (no clues there) whose photos show a p/n 1390477, but whose description says it's a 1394167. Obviously they've just copied and pasted a description of Model M features from somewhere else, and not bothered to substitute their board's actual details.
If I were interested in items like these, I'd definitely message the seller
before bidding and ask them for the p/n and date of the keyboard they're actually selling. If you then win the auction, but get something you're not expecting, eBay has that documentation to back you up.
