1929 introduction – shows thick set with tapered angles
Starting in 1927 with smooth socket walls and recessed tops in Catalog F (1929) these sockets seem to remain the same. Shown is a set of these, and they are matched, but 2 have no logos (early manufacture) and the sockets with logos have the underlined Snap-on. This are seen in Catalog F (also 1929), but not in Catalog G (also 1929). The next series are changed to straight walled sockets.