Nivada Grenchen Chronomaster Aviator Sea Diver 86007M-RUBT

Continuing the lineage of the manual-winding Chronomaster re-editions, the 86007M-RUBT offers a distinctively sporty configuration. The “M” in the reference confirms it houses the manual-winding Sellita SW510 M BH b caliber. The “RUBT” suffix signifies that this model is paired with a black tropic-style rubber strap, a popular choice for dive watches in the 1960s and 70s for its durability, water resistance, and comfort.This reference maintains the celebrated versatility of the Chronomaster design, serving as a chronograph, diver’s watch, and pilot’s watch. It features the signature bi-directional bezel with both a 60-minute dive timer and a 12-hour scale for a second time zone. The dial includes a 30-minute chronograph counter with a regatta scale, a running seconds sub-dial, and a tachymeter track on its periphery.The historical significance of this reference lies in its faithful recreation of the vintage tool-watch aesthetic, enhanced by the period-correct choice of a tropic-style rubber strap. This combination emphasizes the “Sea Diver” aspect of the watch’s identity, offering a practical and comfortable option for water-related activities. The case is made from 316L stainless steel, and the watch is protected by a double-domed sapphire crystal, ensuring modern performance standards.