First of all when looking for a real Philip Stein Watch , all of the watches have an interchangeable watch band without pins but a small clasp to change the strap easily. The fake ones come with a strap that is usually rubber and does not have the special small clasp that makes it easy to change. The fakes have watchbands with pins on the watch band. Also on a REAL Philip Stein Teslar watch , you will never see Water Resistant on the face of the watch. The only thing on the face is the name of the watch not the water resistant label. The real ones say water resistant on the back and have a serial number on the back of the watch. Also note that the 2 chips in the back should always look bright and new. On real ones there is writing around the chip saying Quantum Teslar Technology. Chip made in USA.

Hope you find this helpful.