Today I scored what I think is a real 2420 diaphragm made of unobtanium!
The piece was removed from a working driver and placed in a 2421 box. The seller really has no idea what it is and had it listed as a "used 2412" transposing the box numbers.
My thought is that someone had a pair of Early LE85/2420s and blew out a diaphragm. When they couldn't get a replacement 2420, they replaced the pair with 2421s, and put the good one away in one of the 2421 boxes.
Who here would just change one of the pair of drivers to a different style without changing the other and not put the original away?
My L/R have the 2420s, but my center channel has a 2421. I've been looking for a 2420 since...
Cost was $65.55 + $12 S/H and I figured the chance of getting a holy grail at that price was worth the risk.
Note the raised pads and factory "shim notes" to get the alignment just so. I've seen that on only a few early 2421s. Now, no body even bothers with that.