That's what I thought until I saw the 5059 in metal.
I'm not a fan of Roman numerals and generally prefer baton markers, however, the dial of the 5059 is exquisite and beautifully proportioned. The 5050 actually looks "too plain" when compared to the 5059.
The case seals it for me. In fact, after I saw the 5059 in person , I bought one!