I got this book for my 16th birthday.
Here is a Serbian Dinar with a text: "Spend it wisely"
(worth approximately around 0.16 Euro cents)
Sketch
Inspiration were phonecalls before cells, were everyone had a notebook next to their phone and inside a lot of names, numbers and drawings while talking mostly made with basic pencils.
Red pencil Blue pencil Black pencil
Details
back side
front one