As said above 1900 Luger, 1906 Luger, 1929 Luger, 1882 Revolver and don't forget the 1929 Revolver (basically the same thing as the 1882 Revolver but redone in 1929 likely due to the costs of producing Lugers).
Those each are worth a good amount of money for example the cheapest on this list is the 1929 Revolver and that should cost around 750-800$.