The article introduces into scientific curculation and presents, in greater archeographical detail, a lexicographical monument - a manuscript of the German-Lithuanian dictionary, which was supposedly written by F.W. Haack.
Based on the watermark and provenience analysis, the dictionary has been dated 1720s. Clearly, it is related more closely to the similar dictionary by Krause, which is considered to be a facsimile of the Prague dictionary.