I find it odd there is a parts sticker on the arm, that suggests the arm wasn't that old. I blew up the pic but cannot make out what it says.

However, at first glance it doesn't look like a OE parts sticker to me.

Perhaps the OP can take a better pic of it?

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

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