It is equipped with the caliber 877, also known as the Rolex "Prince". The dial appears to have been re-written, but is quite well finished, with a beautiful and tasteful two-tone dial. It has a beautiful and tasteful two-tone dial, and the mechanical maintenance has been done by us, so we can offer a 6-month warranty. It also comes with a new old stock belt from the 3-40's, which adds even more style to the watch.