I was pleased to see that the author used the PT5000, one of my favorite calibers. As pointed out in the article it's a Chinese clone of the ubiquitous ETA 2824-2; this movement is used in a lot of affordable watches that are sold on AliExpress. You can get a Submariner homage with a sapphire crystal, ceramic bezel, lume, and full water resistance powered by this movement for $100 that keeps time just as well as a Swiss watch (i.e. within COSC standards). Before I sold it mine was running at +5spd... the Chinese watchmaking industry is truly something to behold.
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