Morning Glory Antiques has an enviable amount of antique jewelry catalogs. Not only that, the owner Jane has taken the time to copy many of their pages and post them on her website for reference alongside her remarkable collection of rare heirlooms. I used her website as a starting point when I was just learning about antique jewelry many years ago and was excited to see her post about antique bangles. Some of these gold filled bangles are commonly misidentified, and so her thorough research is very helpful. Here are a couple images from some of the main design periods I pulled from her article.
Victorian
Fine solid gold bracelets, polished stiffened wire, polished square stiffened wire, Roman flower bracelets.
Art Deco
Filigree and band hinged bangle bracelets.
Retro
Band hinged bangle bracelets