I have 3 JL, bought within 2 months time. I do not think they are the most popular model. The 1st one is a Reverso Classique in Stainless Steel, the 2nd one is a Master Control Master Moon, the 3rd one is
the Master Control Ultra Thin.
They are all very nicely made watches. I particularly like the Master Ultra Thin cause I have a small wrist and it looks good on my wrist. It is simple, sleek and understated elegance. In a world, where maybe people are getting bigger and bigger in size, I think the Ultra Thin is being unnoticed by some people since it is neither big nor complicated.