Union Glashütte UNG-27.S1

The UNG-27.S1 is an automatic chronograph movement manufactured by Union Glashütte. Based on the Valjoux 7750, it measures 30mm in diameter and 7.9mm thick, operates at 28,800 vph with a 65-hour power reserve, and contains 29 jewels. The movement features a chronograph with 60-second, 30-minute, and 12-hour counters, a day display, and three push-buttons. Its notable distinction is the inclusion of a silicon hairspring. Currently in production, it powers chronograph models in the Union Glashütte collection.