Stamped into the base of each is "Mirro - The Finest aluminum made in the USA". Both color finishes are still bright and look near new. The lid knobs are made of a light hardwood, perhaps oak. The knobs show their age a bit, but are whole and sturdy. A ring of bottom-wear is found on each base (see image 4). This is caused by years of surface contact and is expected.
Each is marked with a part no. and capacity. The largest is a 4 quart, next is a 3 quart, then a 2 quart, and the smallest is a 1.5 quart.
Perfect for the retro techno kitchen. Beautiful set in rare condition.