Can any of you WWII tool buffs adjust or narrow the window further?
I can't. You've probably got it hemmed in pretty well with those milestones.
Your wrenches, imported at an interesting juncture, to say the least, cast some revelatory glare on some shady history, though.
Hitler and the Reichsbank were faced with a fierce dilemma in those years. Yes, they needed to conserve resources for the war, as you alluded to. But the worldwide Anti-Nazi boycott, which started as soon as Hitler became Chancellor in 1933, had a deeper impact on their economy than most people realize. They needed cash and goods that they couldn't produce in trade. The controversial 1936 Havaara Agreement and the Olympics helped their cause, but the regime was always still in deep fear that a growing boycott would cripple their economy as late as November 1938, as evidenced by many of the memos to and from the regime and the Reichsbank. The numbers were way down, even with the US, which remained as you know a matter of official government policy largely neutral and indifferent to the Nazi policies.
In hindsight, it's not a very good look for Sears, Roebuck & Company. In 1929, those wrenches would've been just a drop in a total imports bucket of 1.79B in Reichsmarks. In 1938, a much bigger part of only 209M Reichsmarks worth of goods US companies were still willing to buy from Nazi Germany.
