My Christophe is at my bike shop, quite a few miles away, so I can't get photos to you for awhile...my mixte does not say "Automoto" anywhere on the frame or on the badge, but the lugwork (and I may be the only person to describe the lugwork as "Shamrocks") is typical of many Automotos I have seen, and one can probably find examples pictured on the net. It sounds as if the lugs on your Christophe are quite different...
Yes, my Christophe originally came with 650B wheels, or so said the older fellow who fished the bike from the dumpster (he proceeded to toss the one original wheel left on the bike).
The word you are searching for may be "conservation," a word used to describe the act of stabilizing the bike's finish, removing rust, etc., but leaving the bike essentially intact.
I will look forward to seeing your photos, David, and I hope you end up with the bike. We will stay in touch, I hope.