The Newmark HS (Hydrographic Service) Chronograph is a special edition timepiece produced by the resurrected British watch company, Newmark Watch Company, to celebrate their 150th anniversary. It is a modern homage to the mil-spec (military specification) watches issued to the Royal Navy (Fleet Air Arm) between the 1940s and 1960s. Key Details of the Newmark HS Chronograph (150th Anniversary Edition): Design & Inspiration: The watch revives the "asymmetrical" case design, which was a feature of the original 1980 Royal Air Force (RAF) issue. The "HS" designation refers to Hydrographic Service, honoring Royal Navy dive/maritime watches. Movement: It uses the Seiko VK64 quartz movement, which is known for its reliability and features a "mechanical feel" to the chronograph pushers. Battery changed Renata 394 SR936SW. Slotted screw down case back. Availability: These were produced in limited numbers, specifically as part of a 150th anniversary, often associated with a special "100" limited release batch. Features: It is designed to be a "modern successor" to the vintage original, blending vintage aesthetics with modern durability. The brand was resurrected in 2018 with a mission to bring back British timekeeping history, focusing on providing high-quality,, vintage-styled watches, including the 6BB Chronograph and 71 Sports models. I am soon going to be listing it's slightly older brother, the reissue with part of a tornado fin. That one is 007 for you James Bond fans out there!