Help a fellow cruncher🙏🏻

Anybody knows the specific model of this Marvin? Couldn’t find a single photo of it🤷🏼‍♂️. Been searching and scanning the net for 3 days now… it is old, I managed to bring it back to life, running great time. I put it on a very used leather strap. Yet I need to know it is a genuine piece🤔

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