Gruen was among the first in U.S. to use the Swiss style of metal dials. Mainly silver plate on brass with black enamel or gold numbers. I am not sure if Gruen made any dials. Always thought they did since Fred Gruen had metal dial patents. Examples here show Fred tried to compete with the best by using same dial as Vacheron. Who made these complex dials? Real gold and platinum? 2 from elsewhere. Mine the Green Gruen.