Here's the IFIXIT teardown & guides for the different watches: · Orginal Apple Watch · Series 1 & 2 · Series 3 · You'll also find some YouTube teardown and repairs on the IFIXIT channel. · Update (03/30/2018) · @adamusik - Take a look at these two images and tell me if they use the same connector system · Original Apple watch (gen1) · Series 1 (gen2) & 2 as well as Series 3 which uses a different part · These parts are NOT interchangeable!! · The construction of the product doesn't conform to the model ID's · The original watch · 38mm: A1553 · 42mm: A1554 · Unique parts! · 38mm: A1802 & A1757 · 42mm: A1803 & A1757 · Use the same parts! · Series 3 Use some of the same parts as the Series 1&2. The case, S1 board & display assembly are different! · The Apple Watch Edition watches are unique as well as Apple produced them using the guts of the original, those solid gold & ceramic watches Apple gave to the Who's Who celebrities before the roll out of the very first watch and sold for $10K to $20K. And later sold the White ceramic version which used the series 2 guts.