I discovered this when I recently cleaned one of my 309s. The eccentric lever is a 21-130. I found this before on another one and considered it a one-off. Now that another has popped up, I think it's possible that the factory may have easily mistaken the two. The thing is, I've been through this reel so many times over a dozen years. Never paid attention to that part #...just cleaned it up and moved along.
As you can see, the differences are barely discernable. The bends on this 21-309 aren't quite as pronounced as on the 21-130.
Anyway, the 130 part isn't made anymore and I "need" all the shiny 130 parts I can get my hands on as restoration goes on and on.
Now, I'm going to pay attention to stuff a little better.