You can download this pdf pattern from here:
The finished size is about: 4.5" x 3" x 1.2" (11.5cm x 7.8cm x 3cm).
Hardware: 10mm x 4mm Chicago screw x6
Leather: 2.0mm (5oz) leather for main body, about 26cm x 16cm, 1.5mm (4oz) leather for strap.
Tools: If you are a new leather player, try to considerate to have tool kit here: http://www.leathercraftpattern.com/leather-tools-...