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[Joepete]

The entire construction of the MM300 is aimed at this watch being a diver´s watch that can be used for professional use. I know that it would probably not be used professionally nowadays, but it has it´s roots in the professional dive world, as it´s "forefather" (300m 6159 Hi-Beat driven monocoque piece) was close to being made "upon request" - different story, sorry

In the above, the L-shaped gasket has been introduced and Willy is totally correct, when pointing out that the antimagnetic feature of the MM300 just adds to it´s term as a professional diver

I have not been able to find a cross section drawing for the MM300, but only for a 1000m professional Tuna. In the link below, Tokunaga explains, amongst others, how anti magnetic ability is achieved in the large shrouded diver´s. I am pretty sure that antimagnetic ability is similarily achieved in a MM300

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