There are many vintage Omega, IWC, Rolex, Tudor, Heuer, Longines watches in the market just to name a few. The prices of the vintage watches are a fraction of the prices of the current models.
Check if the watch is gold, stainless or gold filled. If the watch case is gold, then check for the gold mark. It can be simply stamped as 14K or 18K, 375, 585, 750 or in the form of a hallmark used in Europe.
What is the condition of the case and band? Do not worry overly about the band since most purchasers will change to their own specifications in any case. However, if the band is a