Hi Scout and welcome to the Forum. I have a light Saphire blue Keasby & Mattison Philadelphia. They were founded in 1873 as a pharmaceutical co. Keasby being the financier and Mattison being the chemist. In the 1880's, the co. started leaning heavily toward the Asbestos field and the production of pharmaceuticals fell off. I don't believe there is much monatary value in any of them. (Mine is book valued @ about $6.00.) But it's still a beautiful little bottle and a nice addition to my collection. Hope this helps, Kelley