|Beautiful original very clean 1971 Sub Sea ZENITH A788 EL PRIMERO AUTOMATIC CHRONOGRAPH with rare blue/silver dial only 1400 ever produced in excellent condition. Stunning rare all original blue/silver dial in mint condition set against chrome raised baton markers, el primero red second hand flyback, chrome luminescent hands, 3 large silver sub-registers (60 sec - 30 min - 12 hr), outer silver tachymetre track with automatic date window at 4 o'clock and signed T-Swiss Made-T at 6 o'clock. A rare blue/silver dial from the swiss House of Zenith. Cleaned and serviced 6/20/15 smooth running signed Zenith cal 3019 PHC Automatic Swiss Made 17-jewels unadjusted movement keeps perfect time with all calendar and chronograph functions working. Triple signed (dial,movement,case back) large 39mm all stainless steel case is very clean with no dings, dents or scratches with snap-on case back signed inside Case Movado/Zenith - Swiss Made - PA 53031 Acier inox and outside signed ser 055EXXX - Sub Sea - Stainless Steel in excellent condition engraved "1972 - Chicago Sweepskates - Sales Achievement Award". Comes with new high grade matching blue french leather strap.