Yuandan, it is pinyin for the Chinese word ‘原单’, it usually means those watches that have original Swiss movements inside, on some websites, they saying these watches are made by ‘Yuandan Factory’ or ‘Original Factory’. In our market, most of such watches are coming from Tag Heuer, including Aquaracer and F1 collection. This Tag Heuer watch is a F1 model, made of 904L stainless steel that has matt finish. The watch is equipped with a real Swiss movement and shipped with an original Tag box.
