I see. I'm not implying that it is rare, i'm just trying to figure out if there is another reason for the desirability.
As I understand it the reason they changed from the stainless sight is because it was not as easy to see and ended up being less desirable because of that back in the 1970's when they were new. Now the tables have flipped and the stainless sight is more desirable because so few were produced.
I'm not trying to create an argument. And I agree that it is a desirable but necessarily rare gun.