Montblanc Messenger. SKU: 220322. Montblanc M-Lock Messenger. A refined blend of style and functionality, the M-Lock messenger is crafted from soft, textured full-grain bovine leather and features Montblancs secure M LOCK 4810 closure on the front. Its spacious main compartment, front pocket under the flap, and interior open pocket provide organized storage, while the front lock can be personalized for a unique touch. Details: Material: Full-grain bovine leather. Lining: Linen Closure: M LOCK 4810 front closure, metal zipper. Interior: Main compartment, front flap pocket, open pocket. Adjustable, detachable shoulder strap. Dimensions: 9.4 x 2.6 x 7.1 in.