The REF.648A was produced in the 1960s and features a 36mm case, a size that was uncommon for IWC at the time. While it has a classic appearance, the proportions fit well on a modern wrist. Its design is often compared to the REF.666 “Ingenieur,” but this model uses a snap-on case back, resulting in a slimmer profile and a more understated overall look. Unlike the anti-magnetic Ingenieur, the REF.648A serves a different purpose and occupies a unique position among IWC models of the same era. The dial shows only minor aging and remains in well-preserved condition. The indexes and hands feature onyx inlays, providing a balanced combination of visibility and refined texture, without any notable signs of excessive wear. The watch is fitted with a period-correct Gay Frères rice bracelet with the ball hallmark used for IWC at the time. Its flexible link structure makes it comfortable to wear while maintaining an authentic vintage feel. The clasp code indicates the first quarter of 1966, making it a natural match for the watch. A case, dial, and bracelet that align this well are not often found, making this a piece suitable for both regular use and collection.
