Alex, according as factory register book, here the serial number story: -41016 CC4000 -41020 CC4800-1 -41021 CC4800-1 The 41016 must be at BAKU area at today in a offshore facilities; The CC4800 41020, after Chernobyl service, was sell to trading company and go to Holland for complete overhaul and decontamination, later was buy from UK rental company BALDWINS -> PHILLIPH (US) -> MAMMOET NL (nr. 910); this unis have suffered lot of little accidents. The CC4800 41021 after Chernobyl have work still in Russia in other project and later was buy from MAMMOET (nr. 910) Greetings gabriele