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.) Whatever info you can provide will be appreciated. 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. Thank you!