It's well incised, but that second number is just oddly shaped. Wait a minute. Looking at it from a distance, it may actually be 1562. There are some oddities in the writing style, some disconnections between the lines. What I thought was the upper part of a 7, may actually be the upper line of a 5...which I thought was missing. Then, what I thought was a . actually becomes the lower part of a 6. And this is starting to sound like code.
Forrest