Due to the inset lugs, the case requires a thicker 3-piece design where the dial and movement must be installed from the top. The inset lugs must allow enough clearance for the watch strap while still maintaining enough wall thickness to house the watch movement.

At the same time, the watch should not be too thick or too wide to satisfy customer preferences and expectations as a worn accessory.

I developed a novel method to simultaneously seal and fasten parts without threads, fasteners, or adhesives using standard AS568 O-rings. This was driven by a desire to reduce machining cycle time and part scrap rates.

This sealing method requires minimal external features (no exposed screws, wrench flats, etc.), allowing for a streamlined appearance in the final product.

The sealing performance was verified by pressure testing for fluid ingress.

The fastening performance was verified by environmental testing to induce differential pressure extremes.

I generated a custom calculator and cross referenced previous empirical test failure data to assist with selecting the optimal crystal thickness to meet water resistance targets. The goal was to identify an acceptable balance between performance, cost and assembly thickness.