Gruen | PrecisionGruen, founded in 1894 by Dietrich Grn, was a prominent American watch company known for its innovative designs and high quality timepieces. The "Precision" line, introduced in the 1920s, represented Gruen's commitment to accuracy and craftsmanship. The company's history spans several decades of American watchmaking, with its peak occurring in the mid 20th century. Watch Details Brand: Gruen Precision Model: N A Case Number: N A Serial Number: N A