Lew, I believe the Telefunken diamond is unique. It's too difficult to fake. Most fakes are in the lettering and logos.
Telefunken vacuum tube E88CC-TK; NOS versus brand new.
Telefunken vacuum tube E88CC-TK; I just purchased a pair of these and they are fantastic; they raised my phono to a new level.
Now here's the question, I paid $60 apiece for a pair of these brand new. "Uncle Kevin" at Upscale Audio, sells these for $349. apiece. His are NOS, they should cost more, they also probably last longer, but do they sound better? That is the question. It is not in my budget to pay $700. to find out. Do you have any comments on this?