This 34.5mm. OMEGA CONSTELLATION CALENDAR dates to 1959. This gold capped case having teardrop lugs, correct OMEGA winding crown, gold medallion observatory case back, steel sides and beveled bezel. The automatic winding chronometer grade OMEGA movement is adjusted to 5 positions and temperatures. This gold dial having very attractive patina is all original and looks MUCH cleaner in person. The gold markers and Dauphine hands adds to the vintage look. The Constellation calendar is an uncommon variation in the Constellation line. These particular models are becoming hard to find these days. You will love the look of this watch on the wrist.