http://www.ebay.com/itm/Four-Craftsman-Open-Wrenches-Old-Tools-/200972064883?pt=LH_DefaultDomain_0&hash=item2ecade5873>>>>>>>>>I think these are going pretty reasonable. 

my searches flagged that overnight....was looking this morning and struggling to *date* the bottom feller.  My first to see one.

That black one might date to the 20s or earlier, is just like the pricey one I saw at the antique mall two weeks back.  The underlined ones I have a set of, they came in my fathers 1947 Craftsman tool set. 

I have the very same one.  Condition of mine is not quite as good.  Sears bought the Craftsman name in 1927 from the Craftsman Tool Co in Iowa for $500. If I am remembering correctly, The underlined C came after 1932. They phased it out slowly after WWII.  I have seen things as late as 1950 with it, but some stuff with the =Craftsman= in the same catalog.  Probably they let forging tools wear out before making the change. The 1927-1932 logo has the word Craftsman in a kind of a wave.

Heres a couple that I have, the bottom 2 are the same size but different dates.
The 2 in the middle are CI series, top one is like the one op posted on ebay.

I've had these for a while
http://www.papawswrench.com/vboard/index.php?topic=9154.0

If I remember correctly the "624.5430-50" wrench came with a welding regulator.