The "Bm 617912" is the engine type. Take a look at this chart:

http://www.geocities.com/SiliconValley/Pines/6633/w123models.html

The "Agg. Nr. 874759" may be your engine number. Are the last six digits of your VIN 874759?

Tausch I think means EXCHANGE
Teil means PART

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz