After posting that, it occurred to me that I may have purchased that set just to get that ratchet. The set should have the old four-point-selector model 2875 in it. That is a very rare ratchet. I think I own two of them - one of them is in virtually new condition and cost a fortune. The one in that set is in fairly good condition - just the usual "drawer rash" dings and scratches, but nothing major. Essentially the same mechanism internally as your 2889 1/4" female drive model.
I know for sure I've seen other chrome pieces stamped "D I" - packed in the earlier wrinkle-finish royal blue boxes.
Maybe I'm off on that one. I'm not sure how long they produced the blue boxes - I believe the appear in the 1948 catalog.
In an email exchange with twertsy long ago I submitted "All WWII era Indestro was most likely stamped "D I", but not all "D I" Indestro is necessarily WWII vintage product," with which he was in agreement.
I think it's just one of those myths that's been repeated so many times that it's become one of those "alternate reality" things.
I should dig that set out and put the right ratchet in there. I know I've got at least a half dozen of them laying around here loose. It's just a matter of finding one. I know which box the set is in now.
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EDIT 11/02/18 09:26 PDT
d42jeep -
I may have spoken too soon there. Poking around on "new posts" I found a link to a catalog archive site HERE:
https://archive.org/details/internationaltoolcataloglibraryand downloaded a snippet from the 1958 Shapleigh Hardware Co. catalog which shows that 7602 set in a red box with what appears to be the same ratchet as in mine. I am forwarding to you a *.pdf copy of the file.