This paper focuses on the occurrence of sealings impressed by the same seal faces or by very similar seal faces at different archaeological sites in LM I. Sealings are small clay lumps impressed one or more times with one or more seal faces, and at times inscribed with Linear A signs. Such a sealing system was aimed at controlling the mobilization of resources and goods. The existence of a dense network of inter-regional trade in the Neopalatial Period is indeed well documented by the overall evidence from the material culture. Since impressions left on clay nodules by the same seals or by very similar seals occur on different types of sealing found in different sites in Crete (Knossos, Sklavokambos, Hagia Triada, Gournia, Zakros, and Chania) and outside Crete (Akrotirion on the island of Thera), we can argue that the inter-regional trade was, at least in part, managed by one or more central administrations. The aim of this paper is to clarify this last point and address the issue of whether or not we can infer the existence of diplomatic and legal bonds between the Knossos Palace and the other main Aegean settlements from the sealings.