A Viking Professional 5-ply 6.4-quart casserole (4015-1064CS). Clipper Corporation's current Viking catalog lists this factory number as the 6.4-quart casserole in the Professional 5-Ply satin line, made in the USA. That line's construction, from Viking's live Professional 5-ply pages, is a non-reactive stainless interior, three-layer aluminum core (including 3004 aluminum), and a magnetic stainless exterior, with satin finish, cut rims, riveted stay-cool handles, induction use, oven use to 600°F, and a limited lifetime warranty. The 3.4-quart casserole on the current Viking site ships with an 18/10 stainless lid; the catalog line for this 6.4-quart SKU does not print a separate lid note. The current vikingculinaryproducts.com 6.4-quart casserole URL now shows the 6.4-quart sauté (4015-1064S), a different SKU. Specs from the Clipper Viking catalog and Viking's Professional 5-Ply line pages.
The 6.4-quart casserole. Same 5-ply satin as the 3.4, bigger pot.