This range of Type numbers is not allocated. 900–999 Safety, rescue, liaison & boats for special purposes 920–929 Sportboote (yachts) are unassigned. Type numbers 966–999 are not allocated. Former NVA units After the unification of the German Navies, the Eastern German ship classes got Type codes of the Western system. Especially for those that were soon sold afterwards to foreign navies, this process did not strictly follow the previous rules. Sometimes already allocated codes were reused or the previously spared x00 codes were assigned. But the vast majority was categorized in the previously unused 600-699 range, but even here the same Type code is often used more than once. And sometimes, ships of the same class are spread over different Type codes. References Schiffsnummernverzeichnis für Schiffe, Boote und Betriebsfahrzeuge der Deutschen Marine und des Wehrtechnischen Bereichs (as of December 2002), Bundesamt für Wehrtechnik und Beschaffung, Koblenz/Germany