Thanks Don! Mine is a little different inside. Layout is different, no cast-in sizes for the bits & extractors, yours has several fat nut-like things that probably enable the extractors to be turned--which I believe is the purpose of my missing flat wrench which had different sized square openings along its length. My No. 4 drill & extractor and No. 5 extractor are marked Ridgid.
Any idea which set is older?
Secondly, thanks for the info about the AT tool kit. Any idea who made the tools for Packard / RR--or did they make them on their own?