Item is a cardboard box, still sealed. The insulin is from Lot #72451 B1544, according to the label on the bottom of the box. The label on the front of the box reads: '5 cc ampoule i'letin for clinical test. Approximately 20 units in each cc. Eli Lilly & Company, Indianapolis, U.S.A.' Stamped in black on box top: International Units. This insulint must have been produced prior to April 1923 when Lilly agreed to modify the name of their product by adding the words 'Insulin, Lilly' to the product labelling.