MontBlanc Pen Refill. SKU: 128184. Barcode: 4062037052069. Color: Mystery Black. Size: 2.0 oz. MontBlanc Mystery Black Ink Bottle 2.0 oz. Montblanc's 60 ml Ink Bottle in the elegant shade of Mystery Black features a unique design with a front compartment specially crafted for effortless residue disposal.