Vintage Swiss Military quartz watch 40mm day date with black nato strap gift him

Here’s a super cool Swiss military quartz watch. The battery is brand new and the watch works really well. The nato strap is not original. I added it because I like the military look and it fits the black bezel. The strap has a 20mm diameter and is an easy change. Also it is very stiff on the watch. The watch is very secure on the strap and to move the watch takes some force. This is how the are supposed to fit, so the watch will not move when being worn Please message me with any questions