Set of 5 brown glass laboratory/chemical bottles with green plastic caps. These 250 ml wide mouth bottles are clean and in excellent condition. All the bottles are marked on the bottom with the number 1589 and 250 and a "B" within a circle flanked by 01 and either a 2, 4, 5 or 7 to the right. I believe the B in a circle mark denotes the Brockway Glass Company. These bottles date back to the 1970's or 1980's.