Here are some suggestions:
Ferragamo
Bottega Veneta
Valextra
Delvaux
Moynat
All are high quality, understated, luxurious bags with minimal hardware and no obviois logos. The first 3 brands on the list do go on sale. The last 2 on the list are more expensive. The first 2 brands are quite widely available in most markets.
Good luck in your search!