Here are some very early Plomb 1/4 sets. As shown on the photos, from upper left to bottom right are 1935, 1936, 1937 and 1938. Based on a review of the catalogs, I believe 1935 was the year of Plomb’s first 1/4 drive tools and 1938 was Plomb’s introduction to 1/4 ratchets. Plomb also offered midget wrenches and pliers as part of the sets.
The tools generally came in 4795 boxes and the early ones did not have a raised lip on the upper cover. I think the lip appears in the boxes made in 1939 and beyond with a brief exception in the late years of WWII.