I have the feeling that it is an unauthorized keychain manufactured to sell to places that resell auto accessories. The side that says; BENZ is just funky, in the manner it is lettered, to me. The 3-pointed star side, looks to be more attention paid to authenticness, if you will. I am with pre 1960 somewhere as a guess. How far back, I dunno. But I do not think it is a Daimler-Benz factory approved artwork/creation - I may be totally incorrect in my hunch.

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'06 E320 CDI
'17 Corvette Stingray Vert