21/18mm Black Calf Leather Watch Strap for IWC 3717/3777 Pilot Chronograph Models watches Brushed and high-polished surfaces with

Brushed and high-polished surfaces with a screw-down crown and 20ATM / 200m water resistance

Adjustable Tapered SS Bracelet

Lug to Lug 50mm

a boost up spring to protect from vertical shifting

The black sunburst dial sets the background with hand-embellished vintage scratches

21/18mm Black Calf Leather Watch Strap for IWC 3717/3777 Pilot Chronograph Models watches Brushed and high-polished surfaces withWidth: 21mm Lug ,18mm Buckle(Only Compatible With 18mm Pin Buckle) Length: 75mm 115mm Thickness: 4. 5mm At Lug Area Taper to 2. 5mm At Strap end. Compatible with all IWC 3717 3777 Pilot Chronograph And all other 21mm Lugs Watch Models . Feel free to contact me for any enquiries on all my products . Thank you