Mine is a 1960 and has that same black patina:

This rifle is almost completely shot out. There is hardly a land left in it. The bore is very dark (like the outside metal), and but for the mild pitting, it is nearly a smoothbore. However, the bolt and receiver match and so does the stock:

The stock is also dark and worn smooth. And when I bought it, I seem to recall that it had a kind of mildewy smell to it. But I have not sniffed it in a while, so I can't say for certain what it smells like now.