W opisach jest że to in house, ale do końca to nie tak... Podobnie jak w TH z mechanizmem od Seiko, też podają że to pierwszy ich in house, owszem robiony w całości u nich, ale plany werku kupione od Seiko https://watchtime.me/news/article/1168/presenting-the-ulysse-nardin-diver-42-mm-collection "The classic mid-20th century diver's watch aesthetics are fully backed by 21st-century technology as seen in the in-house Calibre UN-816, which though based on a Sellita SW300, features a silicon hairspring. A 4-Hz movement, it has a power reserve of 42 hours."