Nivada Grenchen Chronomaster Aviator Sea Diver 86007M-BLAL

This reference completes the manual-winding lineup of the Chronomaster re-edition, pairing it with a classic strap. The “M” in 86007M designates the hand-wound Sellita SW510 M BH b caliber, which requires daily winding and offers a thinner case profile. The “BLAL” suffix indicates the watch is fitted with a Black Leather strap, providing a more formal and traditional aesthetic compared to its bracelet or rubber-strapped counterparts.The historical context is identical to the other modern Chronomaster models: a faithful revival of the legendary, multi-purpose 1960s “tool watch.” Its significance lies in offering the purest version of the vintage experience, combining the tactile engagement of a manual-wind chronograph with the classic look of a black leather strap. The watch retains all the versatile features of the family, including the tachymeter scale, the dual-function 60-minute/12-hour rotating bezel, and the two-register chronograph with a regatta timer.All physical specifications are consistent with the other manual-wind models, featuring a 316L stainless steel case, a double-domed sapphire crystal for durability, and the characteristic 38.3mm case diameter. This reference caters to purists who appreciate the combination of vintage design, a hand-wound movement, and a timeless leather strap.