You are looking at what I think is a salesman sample of vintage Esterbrook pen nibs. There are drawlet, manuscript,dip-less , art, and drafting,, School, gold plated, Esterchrome, special, purpose, and grisburne. Estate found. Near complete, as shown with some missing all numbers seem to match nibs. Each card will be placed in a separate baggie. The nibs more than likely will fall out of the rubber band and will probably have to be matched to the number again.