My "E. Witte, Trier" has a leather strap plus a buckle that has a leather-based body, not metallic. The Gottlieb Hammesfahr catalog reveals the leather-based strap and metallic buckle was used on their own Verlangerungsmesser sheath.The bolsters would not have the fine grooves as demonstrated on another fancy bolster Verlangerungsmesser examples.Ho