I still think you are correct. In any event my 300SE passed the california smog test yesterday and the doc states that the EGR visual and functional is N/A, not applicable.
This was the case in prior years, its just that this year I recently had a problem with turbulent idle that I recently resolved with new spark plugs and cleaning the distributor cap.
The EGR question came to my mind as I mentally ran variables that might cause the test to fail my car.

Thanks

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD