There are three badges;
250,000 Kilometers (156,000 miles)
500,000 Kilometers (311,000 miles)
1MM Kilometers (622,000 miles)

Mercedes gives these free after the owner fills out a form and has the mileage attested to by a Mercedes Dealer. You can get the form by calling 1-800-FOR-BENZ

Note: they will ask for the VIN. And if a previous owner got the badge you're looking for; you’re out of luck.

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Toblin

'79 300D, "Liesel von Diesel", 235K

I kid proofed the house....but they still get in