We should always take the time to appreciate well-designed details. Designer and Apple fan Arun Venkatesan has done a wonderful job here explaining the context behind some of the Apple Watch design cues and references.
The iconic watches that inspired Apple Watch faces – Arun Venkatesan
[T]he analog faces reveal what Apple does so well — taking the familiar and making it their own. Over the years, they have released quite a few faces with roots in history. Each one started as an iconic watch archetype and was remade to take advantage of the Apple Watch platform. … Let’s dive into five Apple Watch faces — California, Chronograph, Chronograph Pro, Count Up, and GMT.

The intricacy of these old watches is amazing, so sit back and relax to some smooth jazz whilst this rusty old Rolex is repaired.
Restoration of Rusty Rolex – Water damaged 1996 GMT Master II – YouTube
This 1996 Rolex GMT Master II suffered badly. Soaked in water, it spent two years in a drawer. The amount of rust was unbelievable. Actually, apart from the case and bracelet, only 8 of close to 100 internal parts were preserved. But the core challenge was to preserve the mainplate: the very base of the watch that holds all components together.