I think you'll find that the first number you listed is the second
number (which is actually the catalog number of the item) plus the
preceding "09" which denotes the department number (Sears'
Hardware/Tools is department 9).
I'm not sure where you can find the manufacturer number on the
smaller, card mounted tools (individual sockets, for example). It
might be on the card, but in any event, the Sears format for whole
model numbers (not just the five digit catalog number you referred to)
is xxx.xxxxxx, where the first three digits are the manufacturer, the
period separates the fields, and the last several digits (could be
five, six, or even seven) is the catalog number.
Several years ago I got tired of paying premium for Sears hand tools.
Knowing Master Mechanic carried the same lifetime warranty, I picked up a
set of 3/8 and 1/4 drive tools at a hardware store and mentioned Sears
pricing. The owner, a long time neighborhood store operator, said he had
sockets marked "craftsman" show up among the Master Mechanic sockets.
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