Re: Today's fleaarket finds.
It's actually this set;
No. 4810 1/2-Drive Deep Socket Set-
Fig. 28 shows a 1/2-drive S-K No. 4810 socket set, a collection of nine 408xx-series deep sockets in a metal box. The set model number is given by a faded sticker on the side (see inset), and the 1939 S-K catalog lists a very similar No. 4808 set of eight deep sockets.
The socket models and sizes are, from the left, 40818 (9/16), 40820 (5/8), 40822 (11/16), 40824 (3/4), 40826 (13/16), 40828 (7/8), 40830 (15/16), 40832 (1 Inch), and 40836 (1-1/8). The sockets all have a cross-bar hole for use with the Ell handle included in the set. At the time, deep sockets were intended primarily for spark-plug removal and were usually provided with a hole for use with a cross-bar.
The S-K 1/2-drive deep sockets probably went through the same generational changes as the shallow sockets; in particular, later versions of the deep sockets dropped the cross-bar hole and added drive-end recesses. Although the relative timing of these changes is not known, the 1957 catalog shows that the cross-bar holes had disappeared by that time