IWC Ingenieur 30mm x 20mm Black Rubber Watch Strap Band Authentic OEM
The sizes are 30mm at the lugs, 20mm at the buckle end. The length is 115mm x 75mm. This is the standard size. The inlet size is 16.3mm. The strap is missing one of the rubber keepers. The strap is designed for a tang/pin buckle.