My late 952-1 Blued prefix is KAS, is this what you are referring to a serial that lies in the dead zone?
Aussie Collector has a fine post above, and I mined 'dead zone' from that post. He said:
The factory letters are confusing and inconsistent.
From letters.
952 KAZ0001 - KAZ0399 400 made(actually 399)
952-1 begin at KAZ0461 to KAZ1535 (thats 1075)
What then were KAZ0400 to KAZ0460?
Another letter lists the 952 going to KAZ0459?
My 952-1 is KAZ-042x, so that's a dead zone if you take the data he posted which was mined from different factory letters.
I suspect your post has a small typing error in that yours is KAZ and not KAS as you typed.
However, if your pistol is actually stamped with a KAS prefix, I think you have a factory goof, I have never seen that prefix on any 952.
Two strong thoughts I believe in with great vigor:
1) There are many variations across Performance Center Limited guns, I believe this was due to parts suppliers and different bits and pieces and parts the PC had in stock. They had no care of making them exactly the same, so they put together pistols with the parts they had available.
1A) ...it's fun to compare and contrast them and share what we have and what we see and how they differ. This
is the hobby side of owning these guns.
2) Factory letters are a blessing, and a double blessing when folks choose to share them. They often contain fantastic information that's otherwise nearly impossible to get -- and at the same time, across the board and across the decades, they are also riddled with small errors or erroneous information. I believe this to be wholly unintentional, I believe this is a very inexact science and these letters are written with the best of intentions. These letters are fantastic but they are not infallible and they are not gospel.