I'm wanting to get a Nato strap for my below Seiko (excuse poor quality picture). Having trouble working out what size however. You can see from the picture, that the blue outlined pieces are part of the watch face, and the red outlined piece forms the first removable link of the watch. Looking at 'how to' guides to measure though, has me thinking that the strap should measure the width of the blue-blue pieces. However, that would leave an extremely narrow band (10mm) and doesn't seem right. What am I missing? Cheers.