I am trying to learn as much as possible, including value, about my brother's Rolex. I beleive he bought it in the 80's in Zurich. Which is where he lives.) I understand I can't ask for a value but I'm hoping someone can provide some info and direction. I've attached pictures (I hope). What I can provide is the following. "Rolex – 28.4 mm square. 4.65mm thick w/o crystal. 7.8mm with. On back it says MODELE DEPOSE (MODEL STORAGE) #279293 On face it says ROLEX CHROMOMETER on top SWISS MADE on bottom. On movement inside it says TIMED 6 POSITIONS 18 RUBIES s/n 11513 The strap is original ROLEX" As always any info is greatly appreciated.