The 1016 handsets come in two distinct types – flat and curved. This refers to the fact that on early 1016’s, meaning the gilt dials and Mark 1 matte dials until the ~1.7-1.8m range, the hour and minute hands are flat. After this, both hands become slightly convex for the rest of the model line.
Distinguishing service hands or Submariner handsets is based on 1) if it’s an early model and there are curved hands or 2) if the hands are too short. For chapter ring examples, the minute and seconds hands should extend perfectly to the chapter ring. For non-chapter ring examples, the minute and seconds hands should extend approximately 1/2 of the way into the minute hash marks.
Service or Sub hands aren’t the end of the world, especially if the lume matches the dial, but it’s good to note when deciding on how much to value a particular example. Below are some examples of original and service/sub hands.