Help Identifying Vintage Certina Watch (K.F. 320, Swiss Made, 15 Jewels)

There is not much more to tell you about the watch than you have stated in your original post. Vintage? Could be late 1940s or early 1950s. Gold plated base metal case in decent condition. The K F movement has 15-jewels, and is not shock protected. The dial and the ratchet wheel on the movement tells me this watch is a private label, or contract watch. The Hertig name likely being the name of a retailer. A decent, but very basic manual wind movement. A quick search of eBay completed auctions will give you an idea of what the market place deems values of similar watches to be. Be sure to research completed auctions, not auctions currently active. Asking prices usually determined by owners, and selling prices determined by buyers. As an aside, I’d say about $150.00.