My g series are black oxide finished, could that be the difference?
No. Plenty of E series wrenches are black oxide, too. And I have had some of both through the years where it's hard to tell if they were black oxide and worn off or just plain dark steel. There are some G series that appear to be japanned. Don showed one above. They actually smack of postwar to me, as I have mentioned many times before, here and on G503.com, only because I have postwar wrenches from several mfgrs that have that heavier black finish. For me it only adds to the late war deduction. EDIT: Also adding to the deduction, as mentioned many times before, are the pouches. I don't think I have ever had or seen E series show up in canvas. Only G, and that was a very late (April 1945) Ord Dept spec change. Maybe Don or UNAIU or someone could double check my own analysis from years ago on that. /EDIT.
^ curiouser and curioser.
What part? To be honest, I didn't expect me posting a few innocuous 800 series ignition wrenches that I collect like curiosities, almost out of boredom with collecting E's and G's for so many years, to prompt a review of E's and G's, but there is zero doubt they're both wartime, and not much doubt about the sequence, since they go from 1761-69 in the 1935 catalog to E-61 to E-69 in the 1938, 1939, and 1940 catalogs, and then to 61-69, no prefix, in 1947. Note again that you won't find the G stamped DOEs and DBEs in the prewar catalogs or the 1947 catalog, either, as far as I recall, but there is little to no doubt they are also wartime, and probably late war.
would be real nice to have an Indestro catalog covering at least a bit of 1937-1948
I'm assuming you mean to help nail down the 800 series production?