This BUND strap is acutually used by German Air Force with Heuer, Sinn, Junghans, and others.  Precisely crafted in Germany in heavy leather.

19mm open-ended construction will fit both solid bar and spring bar.  19mm width will fit both 18mm and 20mm lug width watch confortably. 

Leather is treated with silicon material and heated to 150 degrees celcius for durability and better water resistancy.  NATO Ordinace number and 'BUND' embossed at the back of the strap.

• Width: 19mm (to fit 18mm ~20mm)
• Made in Germany

Instruction on how to attach BUND strap.