Values for antique saddles depends a great deal on the maker, level of decoration, provenance and current condition. Unmarked saddles are very difficult to identify to a specific maker, in such cases things such condition, quality of construction and decoration are considered the most important elements in determining their value.
The saddle as we know it today, was developed either in France during the early Christian era or in the steppe region of Asia. In Europe the saddle came into general use in the Middle Ages. The exploits of medieval knights would have been difficult without the saddle and stirrups.
The style and construction of western saddles has changed very little over the last hundred years, but the vast majority we see today like this example post date the 1930's. While highly decorative “Parade Saddles” owned by Western film stars can sell for several thousand dollars, most good quality used riding saddles sell at auction for under $500.00.