Since there are still a lot of people who don't know the differences between these two movements I'll make a short introduction and a "how-to" spot each movement with ease, so even a person with no knowledge at all could say which movement he is looking at.
Both movements are clones of the Rolex 3135 movement. Both movements operate the same way as the genuine one. The difference is that SH/Yuki is a real clone that can accept genuine parts, all of the parts are interchangeable with genuine except for the mainplate and the balance, which some times may work but most of the times it just won't.
On the other hand SA3135, while a clone, cannot accept any genuine part except for the reverse wheels of the automatic mechanism.
What does that mean? If a SH/Yuki has a part failure, it can be most likely repaired with genuine parts, when the SA3135 has a part failure, you just throw it to the trash can.
Stability:
Both movements had DOA cases, and a few issues. However they are both proven stable when they are cleaned and serviced before any damage occurs.
Hands/Dial:
Both movements have interchangeable dial/hands. Both movement will accept gen dial/hands.
How to tell what movement I am looking at?
I'll share a couple of key points so anyone can determine on what movement he is looking at, that doesn't mean there aren't other optical differences, but I wanted to make it easy for everyone to spot the differences.
SA3135:
Looking from the movement center point of view, balance cock has the single hole on the left.
Reverse wheel teeth are uncoated
SH3135/Yuki:
Looking from the movement center point of view, balance cock has the single hole on the right.
Reverse wheel teeth are fully coated
Standard serial number: 5510969
Of course the finishing of both movements is kinda different, but that's not something anyone can tell without having both movements next to each other.
Bonus information:
First batch of noob v6s submariners had the SH3135/Yuki movement inside.
Hope that helps
Both movements are clones of the Rolex 3135 movement. Both movements operate the same way as the genuine one. The difference is that SH/Yuki is a real clone that can accept genuine parts, all of the parts are interchangeable with genuine except for the mainplate and the balance, which some times may work but most of the times it just won't.
On the other hand SA3135, while a clone, cannot accept any genuine part except for the reverse wheels of the automatic mechanism.
What does that mean? If a SH/Yuki has a part failure, it can be most likely repaired with genuine parts, when the SA3135 has a part failure, you just throw it to the trash can.
Stability:
Both movements had DOA cases, and a few issues. However they are both proven stable when they are cleaned and serviced before any damage occurs.
Hands/Dial:
Both movements have interchangeable dial/hands. Both movement will accept gen dial/hands.
How to tell what movement I am looking at?
I'll share a couple of key points so anyone can determine on what movement he is looking at, that doesn't mean there aren't other optical differences, but I wanted to make it easy for everyone to spot the differences.
SA3135:
Looking from the movement center point of view, balance cock has the single hole on the left.
Reverse wheel teeth are uncoated
SH3135/Yuki:
Looking from the movement center point of view, balance cock has the single hole on the right.
Reverse wheel teeth are fully coated
Standard serial number: 5510969
Of course the finishing of both movements is kinda different, but that's not something anyone can tell without having both movements next to each other.
Bonus information:
First batch of noob v6s submariners had the SH3135/Yuki movement inside.
Hope that helps