The Codex S.554 is an early 16th century copy of Paulus Kal's fencing manual of ca. 1470. The original currently rests in the holdings of the Zentralbibliothek Solothurn in Solothurn, Switzerland. The paper of the manuscript bears a watermark that was used between 1506 and 1514, though it may have been created after that. Unfortunately, the manuscript survives only in fragmentary form: just 30 of the original 62 folia remain, including only 57 illustrations.