This paper presents the instructions that appeared in banks in the first half of the 20th century. First, it emphasizes the problems associated with researching this type of diplomatic material, which lie not only in the incompleteness preservation, but also in the inconsistent terminology used in banks.
The following part of the paper focuses primarily on service instructions in banks. It notes the sources of inspiration, the process of creating instructions, their typology and content. It also analyses the underlying factors that led to the revision and changes in service instructions.