Sears catalogs cannot be fully relied on to provide accurate dating and product images, but here's what I know from the research into the RHFT type study:
Sometime in the late 1960s--circa 1968--Sears began to use the words CRAFTSMAN COMMERCIAL as an actual grade designation for its high-end tools and equipment. Instead of just in the item description, they would use the word in the title of the item. Elsewhere in the large main catalogs, they were using a graphic of SEARS BEST in a white oval to tag their premium items in categories like clothing, electronics and appliances. The 1970 specialty tool catalog was the first time the oval graphic was used to tag a tool, the RHFT ratchet. Starting in 1972, they began applying the oval to more items in the tool catalog. The overall impression is that they decided to phase out the COMMERCIAL designation, perhaps because they found rank-and-file consumers would shy away from a "commercial" product apparently meant for contracters or pro shops. By the 1976 tool catalog, the COMMERCIAL designation had been eliminated. So based on the catalogs, the OP's toolbox should be 1968-1975. However, I also found in my research that the catalogs of the time can be as much as two years behind the actual product introduction in the physical stores, which at the time were the largest retail tool distribution network in the world, and so didn't need the catalog to begin selling the products in their stores. In this case, the CRAFTSMAN COMMERCIAL case badge on the physical item could have been introduced as early as 1966 and discontinued as early as 1973.