Just out of curiosity: does an electronic locking differential exist for the W123?

When I bought the car the seller claimed it had a "limited slip differential", but I just assumed the guy didn't know what he was talking about.

I did some Googling on the W123 and found a VIN decoder website. You put in your VIN number and it'll show you all the options the car had when ordered:
Checking VIN for Mercedes-Benz | CARInfo

I ran mine, and everything seems to be correct. It has the leather blue seats, the tempomat cruise control and all that stuff. But it also shows:

SA Code: 467, Electronic Locking Differential?

Is this standard on the W123, is it just plain bogus, or is my W123 just a tiny little bit special?

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"The MB W123 is so bulletproof, you can drive them forever. Which is a good thing as it takes that long to get anywhere."
Betsie: 1984 W123 300D (hobby, 280k miles)
Myrla: 2001 Mazda Protege 2.0 ES 5spd (daily driver, 130k miles)
The Turd: 2007 Toyota Camry (wife's car, 118k miles)