About $350-$450, depending on exact condition. The "Baby" Browing is indeed a .25ACP. The European desination is 6.35mm.
You have only provided a generic description. Trying to put a value on anything with just this limited information provided is difficult. Value depends on a combination of many factors. Without a detailed description to include, finish, barrel length, overall condition, stock material, sights, box, original paperwork and any accessories, only a general estimate can be given. This weapon could be in the 25-115 USD price range.