If you are selling or buying an Apple Watch, it’s important to know the generation as well as which series. The dollar-value and feature set differs based on the generation and series of the Apple Watch.
1st Generation – Apple Watch Sport, Apple Watch, Apple Watch Edition
The original Apple watch was released April 24, 2015 and is also known as “Series 0.” It was available in three variations: the Apple Watch Sport (aluminum case), the Apple Watch (stainless steel case), and the Apple Watch Edition (18-karat rose or yellow gold case). This generation contains Apple’s S1 single-core system-on-a-chip processor. Apple has discontinued this model, but it is still able to run the most current version of watchOS 3.x, though it does so a bit slower than the 2nd generation Apple Watches, described below.
2nd Generation Apple Watches
On September 16, 2016, Apple released a second generation of Apple Watches. This generation is broken into two sub-groups, the Series 1 and Series 2:
2nd Generation, Series 1 Apple Watches
The Series 1 version of Apple Watch strictly comes in an aluminum body, and the only difference between it and the 1st Generation (“Series 0”) Apple Watch is that it has an upgraded S1P dual-core system-on-a-chip processor. This is the “entry level” Apple Watch that replaced the Generation 1, and is currently available from Apple.
2nd Generation, Series 2 Apple Watches
The Series 2 Apple Watch is the second model currently on the market. It is available in aluminum, stainless steel or ceramic cases.
There are 3 additional features on the Series 2 Watch:
- Water resistant up to 50 meters
- Built-in GPS
- Upgraded display that is 2x brighter than the Series 2 or 1st Generation (“Series 0”) watches
These 3 distinguishing features, as well as availability in stainless steel and ceramic cases, are the only differences between the Series 1 and 2 Apple Watch.
For more, I highly recommend this in-depth article from iMore.com.