Also known as Paulaner Original Münchner Märzen
Commercial description
This is the darker Uktoberfest Märzen sold in the USA, not to be confused with the pale Oktoberfest Bier
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Paulaner Original Münchner Märzen

The brewer markets this same or near-same product by more than one names. This can be the result of a brewer distributing this beer under different names in different countries, or the brewer simply changing the name, but not the recipe at different points in time.