A great odyssey indeed Jim
made all the more so by your knowledge, inspiration and support!!
Panzer I just re-read your post. No worries about damaging your treasure with the oil. The brass looks well bonded to the blade and it will not come off. Washcloth or paper towel will do. Wipe on, let sit for a bit, then wipe off any heavy excess. The oil will clean off gunk and surface rust. Just wipe repeatedly until the paper/cloth is clean.
If you're ever tempted to use heavy duty brass polishers like Brasso, be aware that it REALLY cleans the brass down to a bright white look, stripping the patina.
Emanuel