These are fun to collect, usually cheap, and are some of the first Blue Point wrenches made. Date range (26-27) thru (42-43).
The mid 20s x series have a distinct offset which is much larger than post 1927, they are shorter. I have not seen an x series with a 27 date code. The 28-29 x series are somewhat longer and have a date code with 28-29. the x-30 appears first in the 1928 cat.. In general, the lengths get longer thru the mid 30s and after 1933 they stay the same. But exact lengths are often somewhat different than whats listed in the cats.
1930s: Some of the early 30s have date codes, but in about 1930 most of the wrenches were stamped (pat no 1424069) or (pat no 1424069-1). In about 1937-38 (made in USA) stamp was added.
So, 20s, no pat no, no made in usa. Early 30s pat. no, but no USA, late 30s and early 40s, would have made in USA.