That said, the sizing is going to be an issue for those with smaller wrists or who simply prefer a more modern case width or shorter lug-to-lug lengths. Given that the 1941 Principia shares
link the same base movement and is only 39.5mm wide,
link it would seem that the choice to go with a larger case was not due to a movement constraint. Thankfully, the 1969 DeltaWorks
link is quite thin in proportion and has enough water resistance for most aquatic activities.