Hi Pawel,
my 2 cents:
- Ausstattung 44/1: front bumper with guards - US-version
- DB 631: first aid kit/box
- 557:
Maybe option code for transport, logistics and customs; maybe a zip code for a former branch office of Ristelhueber (they had several in Germany); maybe a typo 55/1: steering wheel ivory-colored
- Ristelhueber Hbg.: company for transport, logistics and customs in Hamburg
(company history: "1950-1984: In 1950, Ernst Zügel was the owner of the business, which is based in local and long-distance transport, warehousing, rail transport and customs clearance.")
- upholstery:
Tex 1074 n. perf.: MB-Tex colour 1074, medium red, not perforated
Str. T. 826: ?
Maybe you can find more here:
http://www.mbzponton.org/ ...Wolfgang