S-Cards are silk or stamp issues. The American Card Catalog really just uses this designation for silks but I have added stamp issues here as well. Some collectors classify those as ST-Cards.
Silk issues were unique items generally packaged with tobacco products and exactly what they sound like – items made of swatches of silk. The stamps, however, are not necessarily stamps as we think of them in the traditional sense.
Most silks were printed in the 1912-1915 range, as Jefferson Burdick indicated in his American Card Catalog. However, earlier silks are known to exist as well, dating back to the late 1800s.
The term stamps can refer to actual stamps. However, they are often also referred to as small stamp-like cutouts of paper or cardboard – not necessarily postage stamps with a backing that allowed you to affix the item to something else. The Rinkeydink Stamps, for example, were merely small cutouts from a section in a newspaper.
The stamps that were newspaper cutouts are not merely pictures of players. While their collectability may be debated, the reason they have become sought after is because they were deemed stamps or types of items designed to be cut out in the newspaper. The 1936 Newspaper Sport Stamps, for example, had an outline in the shape of a postage stamp and had the printing ‘Sport Stamp’ on them. It is obvious that they were designed to be cut out of the newspapers as opposed to a standard picture.