Summary

Just rounded the corner for more grip on the leather band and consequently enlarged the width screw.
I've utilized it to create u clock strap for my broken swatch ultra-plate chrono. You can download the template and the buckle here: https://www.thingiverse.com/thing:7255016
Utilized also G-Clamp fully printable to fix it on the table: https://www.thingiverse.com/thing:1673030