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There's a nice selection of hangers for Prinicpias available here: https://www.elanusparts.com/principia-derailleur-hangers
I've ordered the D124 for my 2001 Rex. The part has an extra screw hole but the shape looks right. Here is the bike, it's a size 59:
Thanks! A couple more. These were taken with the same camera and developer but with Tmax 100 film.