It's sold simply as RLM 73. Euro Dark Green is a different Model Master color. They are similar in shade, but RLM 73 is a lot grayer than Euro DK Green (which is a blue green).
RLM stands for Reichsluftfahrt Ministerium (roughly: Gov't Aviation Ministry). The RLM color numbers are similar to the current FS (Federal Standard) colors used by the military and other organizations to standardize paints made by different manufacturers.