This is a working E.J. Schermett stopwatch. It's condition looks good as well. It's a Swiss made stopwatch and seems to be of good quality. Don't see many on here too give much more info on it. Alls I can say is it's good running and as well looks good. Not sure how the back opens on it as I can see a hinge. Probably a jeweled stop watch but will stand corrected if it's not since I don't know much about it. Will be packaged to be received as you see it. Good luck