the first two piece blue box was introduced with the advent of model numbers, around 1957 - 1958 through 1966.
This seems to be generally true for the K and N frame revolvers. However, blue boxes appeared for the I and J frames a bit earlier, probably around 1954. Of course, I and J frame guns were not shipped in the gold boxes. The boxes for the postwar small frame guns were red.
I disagree.
What many of us call Blue/Black (B/B) boxes appeared in 1955. We call them Blue/Black because they were a very dull blue that faded to a very dark Gray that looks like faded black.
Some very late 5 Screw and the early 4 Screw Masterpieces were shipped in them. Not too surprisingly, some very early 4 Screw Masterpieces shipped in Gold boxes. Grab what's close and get 'em packed!
The early 5 Screw Mod 1955 Targets shipped in B/B boxes, and so did some 5 Screw Mod 1950 Targets.
Some late 5 Screw Pre 10s shipped in B/B boxes.
I am sure of all of the above because I have seen all of the above in high condition, complete packages that I am certain were original. In some cases, they were from the original owners. In a few cases, I saw original sales receipts.
Here is a K-22 box for # K275297. Note that the bottoms of the B/B boxes are usually faded less than the tops because they are protected from light by the top. Light fades them. Apparently, any kind of light.
Below is another B/B for K-22 # K284941. Note that it is deeper, longer, and wider than the above box. When S&W first offered Target Grips for the Masterpieces, they were still using Gold boxes. The gun will NOT fit in a Gold box with the Target grips mounted, so S&W shipped some Masterpieces that were early orders with TG in the Gold boxes with the grips dismounted and wrapped in brown tissue. That probably led to some damaged grips and complaints. I SUPPOSE S&W ordered these deep, non-printed boxes to save time and get that problem solved. This same generic box was used for those N frames I reference above.
This last pic shows the difference in length and width-