"Dolne" revolver with a dagger-style hammer, also known as the "Apache," with a pin lock, six-shot capacity, 5 mm caliber, double-action. Hollowed-out cylinder. Frame stamped “L.DOLNE BREVETE” and iron knuckle with 4 rings. Hammer without a crest. Straight, flamboyant blade with a locking notch and a central ridge; the entire assembly folds to form a knuckle duster. Length with blade: 19 cm Brushed finish. A.B.E. Circa 1870. DOLNE Lambert, a gunsmith from Liège (Belgium), inventor of the Apache revolver (a folding American knuckle duster equipped with a folding blade as well).