Could be a mix-master. I have thought about trying a 3rd gen top end on my Model 439 for the better sights and lack of the sloppy fitting, removable barrel bushing. As I see it, those would be the reasons for doing such a thing.
"The chart"?
459 transitioned to the 5904 and the 659 to the 5906 but there was no 359 and the 5903 wasn't introduced until 1991 so I guess the 459 as the closest thing. Finish on label is "C" too.
It turns out this is likely a 4590. The chart for this model states that only the box it came in is labeled 4590 but the pistol itself is 459 marked. Transitional pistol from Gen 2 to Gen 3.
Like this?It turns out this is likely a 4590. The chart for this model states that only the box it came in is labeled 4590 but the pistol itself is 459 marked. Transitional pistol from Gen 2 to Gen 3.
I don’t think this is correct. The “4590” would appear opposite from what you described. The pilot/transitional guns had 3rd Gen featured frames with 2nd Gen(ish) looking slides. You would see a three digit model number on frame but with the one-piece Xenoy grip, a pre-Novak fixed sight and a four digit model number on it’s original box end label.
If you are looking at a 459 frame with old style two-screw grips and a 5906 featured slide, that’s a mixmaster.
Nothing bad about it whatsoever, but no collector gun or wild scarce original factory creation.
I'm not really sure these were "transitional" since there was no Model 359 to transition to a 5903. These are more of a T&E/pilot pistol that were ordered by some LE Agencies. Stainless was the thing but they wanted the lightweight alloy frame and the 5903 wasn't introduced until 1990.Transitional pistol from Gen 2 to Gen 3.