Hi mate. Given the budget and the fact he loves the Seamaster, I'd say go for the Orient Ray 2.
Apparently they have great accuracy and you're getting an in-house movement. Great lume too. 200m water resistant, 120 click bezel, engraved screw down crown and they have hacking and hand winding. You can buy them on Amazon, the black one is about £130 and the sunburst blue about £150. Here's some pics:
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