That's a really cool old anvil. I wonder what the dimensions are?
I've used stake anvils quite a bit in the past, but they were all block type anvils. Basically a 4x4 piece of steel with a spike welded to the bottom to be driven into the stump of your choice. Those are good fun to forge on, and quite usable for knives, but a smaller stump anvil like that one appears to be? Not my first choice for anything but light forging. I actually have one that looks quite similar to that one (although mine looks to be a little bit smaller, but again its hard to tell from a picture) and I've done some very light work on it just as a proof of concept. It was interesting, but not something I'd ever use in actual shop work.