Looks like a model 15 - or possibly a K38

I can't tell you the year, but I can tell you that in it's condition it's value is very low. I do know it is from before 1980 since it has the pinned barrel. But others who have the book to look up serial numbers will be along to tell you more about its age.

If you soak it in ATF and then rub it with bronze wool a lot of the rust should clean off and it will look better - though it will never look all that good due to the rust pitting the surfaces.

It is missing the extractor rod, but a replacement should be pretty cheap and easy to find. It has potential to be a good shooter if the internals are in good mechanical condition, and the bore is not too rusted or pitted.