Wow! Thank you to everyone for all of the information, it was far more than I expected. I screwed up! I mismeasured the shell forgetting that the fixed cup was still in there... duh. It was way too late and dark and I didnt see it. I was running errands today when I thought of it. Oops! Measured in daylight it IS in fact 68mm after all. The cups have one ring and the knurling is criss crossed so it should also be french threaded. Sorry for the false alarm and thanks again to everybody for the help!

One other question: has anyone used the IRD cups with a Tange 3922? I know that Tange makes the IRD bottom brackets and it looks like they have the same style removable cups and bearings with the Tange using 37/17/10 bearings and the IRD using 37/16/10 from what I've found online. It should work right? IRD's site says they'll work with some Tange BBs but their official store says for IRD brackets only.