the 1000sel was a special model 500SEL or 560SEL with a slightly longer wheelbase than a standard SEL. It has been discussed before on this site, but yes it was a special order model for specific markets.

do a search of this site for 1000SEL see what you come up with.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon