The dial layout and overall styling of the new El Primero 410 are a distillation of the prototype sold at Christie’s. Key details like the placement of subdials, calendar apertures, and tachymeter all remain the same. One of the more notable updates is to the case size: at 42mm, the new model is substantially larger than its more modestly-sized predecessor, which clocked in at 38mm.

In this instance, the larger case is advantageous to the watch’s highly detailed dial, with no fewer than three subdials, three apertures for the calendar function, and a tachymeter scale for the chronograph. The smaller case size in the original reference resulted in more constrained design choices, namely seven baton indexes compared to twelve on the new model. With a complete set of hour indexes, the new model appears more refined and fluid in terms of design, with a less pronounced focus on the subdials.