Copco Stacking/ Nesting Pots Pan Anodized?? Stock? Rare

Copco anodized (that’s what it looks like to me, but I could be wrong) pot pans to me there should be considered like stock pots although two of them are small for stock pots, I can’t find these anywhere when I research them, but they are definitely Copco. They are marked each one on them. They presently no have some tape residue on the outside cause they have been taped together steel handles. They look like they barely been used in general.. I know I do not know what each one hold as far as ounces. I consider these to be very rare because there is just like nothing to find out info on them.