The "scars" look like they are faults in the production, areas where the glaze is not completely covering. I think it is for domestic use, not an export piece, as it is not marked "CHINA" which was needed to import in to the US after about 1891. Rubber stamps were used in the 1800's, but the foot is completely glazed and rounded, which is not like (older) qing cups.
I'd guess Republic period, 1912- 1920's. Value ... hard to say, depending on where you are in the world you are. As a single cup in a us antique store, probably about $20-30. I cannot read chinese, so what is inscribed on the cup could actually be critical to knowing the date and the value.
Here are some cups I have, showing 18th, 19th and 20th century. Notice how the foot is tall and "square", rather than rounded as the one in your picture.
I can't post them, as it is too big (800 x 300) ????
http://i54.photobucket.com/albums/g117/ ... ears-1.jpg