One troy ounce of .999 fine silver from Engelhard, the Newark refiner founded in 1902 that was at one point the largest refiner of gold, silver, and platinum in the world. The bar carries the Engelhard name with the weight and fineness, and most carry a serial number; one common style measures about 50 by 28 millimeters and 2.3 thick, roughly the size of a domino. Engelhard made 1 oz bars in several styles across the 1980s and stopped making silver bars that decade, so the exact style you receive depends on what is in stock.
Expect the light handling marks of a bar that has been around, and a test before it ships, which every bar here gets.