It also wouldn't have made much sense as the Aquanaut Travel
link Time ref. 5164 remained in the catalog in rose gold,
link so two generations of watches being in the catalog together was unlikely. The new white gold version brings back a white-metal option to the catalog, using the same caliber 26‑330 S C FUS movement, so yes, this is mostly a case metal and dial/strap color change. But
link it also changes how the watch wears on the wrist.