Lancaster | Accessories | Sonni San Francisco Vintage Wool 。Sonni San Francisco is a distinguished vintage millinery brand known for its high-quality, artistic women\'s hats. Founded by the Del Monica family, the company operated from approximately 1950 until 2005.The brand\'s name originates from Herbert \"Sonni\" Del Monica, a master hatter whose father also ran a San Francisco hat company. Sonni hats are highly sought after by vintage collectors for their structured designs, premium materials like 100% wool felt and fine straw, and elaborate embellishments including feathers, veils, sequins, and jewels. This hat is in great condition with no flaws.