459 should be Aluminum frame, carbon steel slide, blued
559 should be Steel Frame & Slide, blued or nickel plated
659 should be Stainless Slide & Frame, (silver)
5906 also Stainless Slide & Frame, (silver)
5904 Aluminum frame, Carbon steel slide, blued (like 459)
Transition pistols were mostly 4590, 6590 full size and 4690, 6690 compact with 4 being blue alloy and 6 being silver (stainless full size, alloy compact?) as I recall.
459 should translate to 4590 to 5904 etc.
Pictures of pistol and box end would help clarify.