Mine is an ex-army gun stamped 10/81 on the slide. If you know how to read the proofs and various stamps you can read the history of the gun almost like a book. Mine has been a very smooth shooter and 100% reliable. Accuracy is very good with whatever I have fed it. I acquired mine maybe six years ago for around $250. In retrospect I consider that to have been a steal.
Just as a note, my shooting buddy recently acquired a similar gun and complained to me that he found the recoil to be a bit punishing. I recommended that he change the two recoil spring, which he did. The gun now shoots smoothly.