The "275" may NOT refer to color ID.

The nine three-digit numbers on your plate usually refers to the options fitted at factory to that specific car. For your info:

275: memory swicth for seat and steering column
412: Electric sliding roof
550: Trailer coupling with detachable ball neck.
491: U.S.A. version (many equipment which is sold separetly in Europe is included in this option code, like central locking, power windows, window tint, etc, etc, etc.)
810: Sound Package
551: Anti-theft warning system
581: Automatic climate control
757: Radio Becker Grand Prix 2000 for the U.S.A.

The other three-digit number on your plate: 702 refers to your exterior color: smoke silver.

The interior code is usually NOT shown on this plate, it is listed on your production card which on European cars is attached to your maintenance booklet.

According to my catalogs, the W124 was fitted with three interior leather colors [very similar between them]:

Code 275: Cream Beige
Code 265: Mushroom
Code 255: Cream

Now, I could be wrong and actually 275 specifies your interior color as Cream Beige on your ID plate (which could be an specific info attached to ID plates to U.S. cars).

Check your production card (white and blue) or ask your dealer based on your VIN number.

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A. Rosich
CL 500, 1998
S 500 L, 1998
E 320 T, 1995 [Sadly sold ]