Well, any markings look to be gone, it is typical of the many revolvers made between the late 1800s and the early 1900s. Most were made in Belgium but Spain and France were also guilty. It looks to be in the style of the Webley bulldog, I believe every gun maker in Belgium copied them, scale is hard to determine but .320 was a popular caliber at the time.They were not high value when new and even today , unless it is like new, they do not bring much in the way of money. Your gun is a relic, perfect for a nice display and to lie about its history when company comes over.