vintage wood burning stamps, solid copper branding irons w/ iron rod handles numbers set

Set of old branding irons made for numbering wood crates or wood shipping boxes - these are solid copper with iron rod handles. They're about 22" long end to end.

There's a W (or M), and numbers 0, 1, 2, 3, 4, 5, 6. and 8. Number 7 is missing, and I'd expect that the 6 is also the 9. These are worn and tarnished from age and use, but look very usable yet.