Mine is a Manurhin PPK/S in 22LR in factory Duraguard finish. Not sure if they even made them in 22 with Duraguard but I'm hoping.
If I found one NIB locally I'd gladly pay $800. Any more than that I'd really have to think about it... in reality if a collector has one they'd probably want a lot more.
Why? I collect 22 pistols and prefer ones that look and function like their center fire counterparts. I prefer stainless over blue but NO ONE makes such a gun in stainless, except for the American TPH but that's ammo pickey, can have quality issues, and doesn't have even an internal slide lock. (yes I know there are stainless MKIIs and the 2206 but like I implied I like the exposed hammer and full length slide)
Next best thing would be a Walther PPK/S in their Nivel finish, but IMO the Duraguard looks better and is more durable.
I have an electroless nickel Bersa 23 that's in good shape and very PPK-like, but it's just not the same.
To anyone that actually read all of this, thanks