I have the enamel-dialed twin of the 5119, the 5116G. I think you would have to be pretty negligent to break this watch by over-winding. The inclusion of the small seconds hand provides exquisite balance to the dial and in my opinion blows the 5120 out of the water.
5119 is a beautiful and timeless classic. You will not regret owning one and the hand-wound movement only adds to the charm.
Best wishes to you!
Steve