Thanks for the info so far all!

In response to what has been put here so far ...

1. Is there a place on it where the grade is stamped?
2. I don't have any shells with it .. I assume it is a 12-gauge ..
3. Thanks for the congrats! It doesn't look like the screws have ever been turned! I am in Los Angeles, so if anyone knows an expert around here ...
4. I won't clean it! Thanks for the advice!