Hallo there OP, I too have looked out for under the radar designers, particularly the ones who specialize in leather goods, rather than those who started with clothing or shoes and then branch out to bags, nothing wrong with them, just researching the leather goods world...
Anyway I digress, I found out many many not very well-known brands and designers, just for fun, and there are tons! Mostly from Italy and France, Europe, if you google you can find them. The ones that have websites are Valextra, Delvaux, Linea Pelle, Moynat, Moreau, Rabeanco, M2Mallertier, the list is near exhaustive.
Thank you! I also like designers from Italy, I got a Paolo Masi for 2.99 on eBay and it is the softest leather I ever felt. Thank you for the recommendations!