The Seastar name first appeared in the Tissot catalogue in 1954, but not as a dive watch, or a chronograph. It was in reference to its caseback, which used new technology to repel moisture and dust. The latest iterations certainly do that. True to its name, the Seastar 1000 offers up a whopping 300m (1000ft) of water resistance, due in part to its screw down crown and caseback. To achieve this in the chronograph version, the brand has also designed funky, screw down pushers.
Serica came back with strength in 2021 when it released the 5303, the brand’s first diver. This model doesn’t look like the 4512 in any way except for the Broad Arrow handset. And while brands normally carry over their unique design language from one model to the other, Serica did not. The 5303 looks like a Serica but it doesn't look like the 4512. It’s quite strange, to be frank. But in many aspects, the 5303 is to me the better of the two models.
Of course, the main difference here is the CuAI5 aluminum bronze construction. Aluminium bronzes are desirable for their strength and corrosion resistance when compared to other bronze alloys, such as tin or bronze. This is the first time Nodus have plied the bronze watch waters, and the result is sharp.