Just buy a Casio F91W Anna - costs sweetie money runs for up to 10 years on one battery and it's so cheap you throw it away when the strap breaks after about 7 years ... AND it was worn by both Obama and Bin Laden so you could say it has universal appeal ... just be careful going through US Immigration wearing one!
No matter how many "good" watches we have, all watch collectors have at least one of these!
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Apologies from the Naughty Corner for going off topic!
I'm confused. Where do you mount the tank on that thing?