As smartwatches have matured, the benefits of having a computer on your wrist have become clear. So clear, in fact, that some watch aficionados have given up their beloved mechanical timepieces. The Montblanc Twin Smart Watch Strap aims to append a digital solution to your traditional watch. It has a curved OLED display housed in a stainless steel case that doubles as the clasp. It can display phone notifications, tracks your activity, and handles mobile payments, or pretty much everything you'd want a smartwatch for anyway, without the need to put your mechanical piece in a drawer. Available in 22 or 20mm widths with your choice of four different straps.