You have an old keywind swiss pocket watch. "15 RUBIS" means the movement has 15 jewels. I do not generally collect swiss watches. There are collectors on the NAWCC (National Association of Watch And Clock Collectors) website that may be able to give you more info on your watch. Try there message board. A photo of the movement and all markings on the watch and the case is also helpful. Go to NAWCC.org . I believe the message board is open to non members.