Ulysse Nardin marine chronometer with the name SS Ciudad Santa Marter on the case.Condition is nice, the movement works the full length of the fusee and timekeeping seemed fine however I did not time it to the second. It will certainly need a service if you are going to run it every day.The movement is stamped with the last two digits on the dial on each bridge and part of the movement. The helical spring balance is in great condition. The brass case as some light surface corrosion which I have pictured.This is a great item, one which can be displayed in a collection or used as a beautiful desk clock in your office.The outer case is approximately 7 inches wide and 9 inches tall.The dial is nice with light patina and staining in places but as you can see it is still in very good condition.If you are not sure of anything please ask.