In summary the Obscura is an artefact. It was designed specifically within all the normal watch constraints, i.e. a round watch that tells the time with central hour and minute hands but manipulated to look less conventional and more like a mysterious timing device. Something (when housed in its canister), that if discovered in the undergrowth should probably be left alone, or handed in. This is a watch of suspicious origins, perhaps military, perhaps alien. It is obscure, subtly so and definitely more than the sum of its parts.
The Obscura is a manual wind wrist watch.