At the end of the 19th century, the German linguist Georg Wenker began collecting linguistic material and compiling Sprachatlas des deutschen Reichs (Language Atlas of the German Empire). The atlas also included Lithuanian linguistic material from East Prussia: 61 cards with translations of 40 of Wenker’s sentences from German into Lithuanian were collected. This article presents a study of the morphological diversity of verbs in Wenker’s Lithuanian material. The aim of the study is to determine whether the variations in verb forms in the translations reflect the dialectical features of Lithuanian of East Prussia.