It looks like a grocery order book. The biro is the order and the pencil (price, extra items) is what the grocer added.
My grandmother used to have one. It was taken to the grocer every week and he made up the box, added the price and any extra items she rang in with (go her - a phone in the 1960s!), and then she paid on delivery and got her book back for next time.
Her handwriting was more like the pencil though. She was born in 1906.