Up and down the line-up are potential classics. All the grand comps. 5320 maybe just the right combo of a modern and vintage-feel perpetual. And look at the detail in the casework of this reference. 5178 with cathedral gongs, cream enamel dial, and Breguet numerals is sublime. Add in the 5131P and 5170P--beautiful watches. The bracelet of the 5131P is a surprise and a statement.