Nivada Grenchen Chronomaster Aviator Sea Diver 86007M-OYST

This version of the Chronomaster Aviator Sea Diver, reference 86007M-OYST, features the manual-winding movement denoted by the “M” in its reference code. The “OYST” suffix indicates that the watch is fitted with an Oyster-style stainless steel bracelet, known for its robust, three-link design. This bracelet offers a different aesthetic compared to the “beads-of-rice” style found on the BRAC models.The watch maintains the core identity of the modern Chronomaster collection, drawing heavily from its versatile 1960s predecessor. It is a highly functional “tool watch” designed for a range of activities, featuring a chronograph with a 30-minute counter (including a regatta timer), a tachymeter scale, and a dual-purpose bi-directional bezel with both 60-minute and 12-hour markings for timing events or tracking a second time zone.As with the other manual-wind variations, the 86007M-OYST is powered by the Sellita SW510 M BH b caliber, a Swiss-made hand-wound chronograph movement with a significant power reserve. The case is crafted from 316L stainless steel and features a double-domed sapphire crystal, providing a blend of vintage looks with modern durability and scratch resistance. The combination of the iconic Chronomaster dial and the classic Oyster-style bracelet makes this reference a popular choice for those seeking a sporty and timeless look.