Only if it has an AR coating (the AR refracts the light). The cyclops on my TT GMTIIC has AR & it is the only part where the light refraction creates the rainbow effect
As Nanuq said
If you have a gen & aftermarket xtal of the same type under the same light, the gen should sparkle more. But basing authentication on light refraction is not a reliable path to follow.
Without a pic, it is impossible to say how much of a tell your zero risk leak mod is. What I can tell you is that if your mod looks like a working gen valve, it is not a tell. Otherwise, it is.
I still remember hearing 'Paint It Black' coming out of my (& everyone else's) transistor radio while lying on the sand at the beach. Now, nearly 50 years later, I can play the song, at will, on my ipod.
There are alot of people who would pay Patek to work for them. But, knowing their standards, they are probably looking for someone with ALOT of experience.
Wow, that is a pretty serious-looking device you got there. I paid nearly the same for my mid-level watchmaker's 'scope (under plastic cover in top right corner of my pic) & mine looks like a kindergarten toy next to yours.
It may very well be available, but just not popular enough for most sellers to stock. I would inquire of a few of the sellers here to see if they can source it for you. Otherwise, search google & keep your fingers crossed that you do not get ripped off by a rouge rep dealer.