PERUVIAN BITTERS with W&K monogram on reverse
P 66. Applied top. This bottle is listed in Ring/Ham as extremely rare and we'd have to say we have not seen many in clear or colorless. If anything, this one runs with a hint of amethyst although it's not really obvious in the pictures. It would most likely turn purple under sunlight. They actually come in a number of clear variants from smoky gray to aqua. A grade 8 bottle with a tiny flake off the back lip.