Any idea what these are worth in very good condition?

Thanks

Check ebay. It's a pretty efficient market for anything that can be shipped by common carrier for a small percentage of its value and the sale of which is unregulated. I've seen a few All Americans come up there and they will typically sell for about twice the price of a contemporanous Weaver in a similar power. It is imporatant that it is the constant-centered reticle model.