Rolex

I plan to get a Rolex for my wife - either the 31mm OP 177200 or AK 114200. Can someone provide some info / opinion... 1. What movement used for this OP? Cal 2130? 2. If my finding is correct, how good it is when comparing to Cal 3130? 3. Which 1 you will... 

Ref 177200 has a diameter of 31mm and is powered by cal. 2130 Ref 114200 is larger (34mm) and powered by cal. 3130 they are both nice watches but I would go for the largest. Cheers Jeff...  

Hi, Jeff Thanks for your pictures and info. Actually, your picture of the AK is the one that I plan to get. But, I just try to find out more on the Cal 2130 as 31mm maybe is more suitable for my wife. Thanks. TK

but I have never heard of a bad Rolex movement.... Cheers Jeff

Runs at 28,800, 29 jewels, shockprook. Like Jeff said, Rolex doesn't build a bad movement!

Thanks for all the advice. The AD will show me both for comparison. Regards. TK