Rexus31,
"Do you have any photos of what the box should look like for a Centennial set of this vintage?" Sorry, I forgot to answer this question.
The overall design of the box you have and the correct box for your ABB Co. Centennials is the same but there are subtle differences. The easiest difference to see will be found in the blue square with the Brunswick "B" and Crown logo which is located on the upper left hand side of the face of the boxtop. The blue (with black line enclosure) logo on your box will measure 55mm wide and 52mm tall overall ( I used the metric system here on purpose). On the lower left hand side and the upper right hand side of your box there will be an open panel with Code No. 002-70-500 printed at the top of the panel and Made in Belgium printed at the bottom. The blue color is moderately light in tone.
The blue (with black line enclosure) logo on the box in which your balls were shipped will measure 2 1/2" wide by 2 5/16 tall, clearly larger in a side-by-side setting. On the lower left hand side and the upper right hand side of the box in which your balls were shipped there will be an open panel with "Code No." printed at the top. In one of the panels, you should be able to find the hand stamped notes stating 2-7-5 plus the balls size 2 1/4 and what I think was the inspector's initials (but I do not know that for certain). The print font on all of the words on both boxes is virtually identical, but the letters of the words POCKET BALLS are spaced farther apart on the box which is appropriate for your set. The blue will be darker in tone.
Code No. changes were frequently done "on-the-fly" at Brunswick. My research shows that the phenolic resin Brunswick Centennial ball was first catalogued in 1951 and was given the Code No. 2-7-5. That early run was shipped in the box with the Little Man Leaning Over Shooting logo. The number font on the earliest Centennial balls was finer and a very sound argument can be made that the first Centennial balls were manufactured in Europe, probably England, at the house owned by the American group that also owned ABB Co. at that time. Les Usines did make a darted phenolic resin ball at roughly the same time, but it was clearly obvious that it was a Belgium made ball. But back to the point, it was not until 1962 that the 'Blue "B" and Crown logo' had been fully implemented and by then the ABB Co. manufactured Brunswick Centennial that we all know and love appeared exactly as your set does today. I think the final Brunswick Centennial to be manufactured in Albany was shipped in early 1985.
There were cast phenolic resin carom balls catalogued by Brunswick in 1948 and the World Famous phenolic resin "Red Dot" cue ball was introduced at the same time, but they were both noted as "Imported" on their packaging.
Best regards,
Boxcar