What's the plural of Mercedes-Benz?

We saw this car at Motorland in Arundel, Maine last week. For the story on a Canadian 190SL, see below.

From Alex Emond: "In 1959 American cars had fins and were trying hard to look like jets or rockets, and were, quite often, massive. Hyperthyroid.  [AL:  there was of course the Corvette] Same year, in Germany, Mercedes created this sleek little car. This specimen (below) is at Heinz O's little backyard garage in Banff, Alberta. He is retired and in his 80's but many old clients still seek him out as a respected master mechanic to keep their wheels happy. Let's say "semi-retired." Heinz specializes in German vehicles but is not above working on the 1960 Jaguar I saw a few weeks ago.

AL: here's a link to the 1962 190SL we caught in Blue Hill, Maine. Or take a ride in this 1954 M-B Cabriolet 220.