They qualify for classic plates in most states, it's an age thing.

By it's meret as a fine automobile, and especialy being chrome and shiny with a nifty looking interior, sure I'd say it's a classic. People stare at mine when I pull in a gas station...

Re: book value.
About any book value is worthless for older cars, it's supply and demand, and market value. Any running, non terminaly rusty 300D should be worth $1000-$1500 I believe, a truly nice one would be worth $3500, sure. But beware, *nice* is a relative term..

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One more Radar Lover gone...
1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K