It could be Zentra-Kraft-Ost which I believe was an organisation set up to take care of vehicle problems in Russia such as provision of spare parts, repair areas, tires, fuel and the salvage of vehicles etc.
Thank you very much! I looked into Tessin vol.1 for abbreviations to no avail, but since now I have a good hint, I may end up with a much better idea of the set!
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