Which IWC watch is this strap original made for?

Please help me to identify which IWC watch is this strap originally made for?
Thanks.

Hard to say because this kind of strap seems to be widely used on a few pilot watches. Since it came with a pin-buckle, maybe something like a Mark XVIII Le Petit Prince?

If memory serves me...this strap was originally supplied as the OEM strap for the limited edition St. Exupery Pilot Chrono around 2006. I believe it was 21mm and the color was a bit lighter than your photo. However, this strap ages beautifully and darkens quickly as it soaks up body oil like a sponge. The result is a very pliable, comfortable and vintage look. I use one on a Pilot classic chronograph ( 3717 ) and love the look. More recently, the strap was introduced in a 20mm size as the OEM strap for the original Le Petite Prince - MARK XVII. This strap is very versatile and can be paired with numerous IWC models. The newest MARK XVIII's use the same look by Santoni in Black Calfskin.

Andy

Wow. You guys are awesome.
Thank you for the information.