Watercolor Painting "The castle park" ec. English ? + supervision

Old watercolor painting representing the park of a very beautifully crafted castle (very fresh colors). A mark on the paper visible in close-up on photos. The frame (more recent with some marks) is offered with - I can remove the glass so as not to take any risks on simple request. Dimensions of the view: 20/30 cm, with frame: 41/50 cm thank you in advance for contacting me for any additional questions