name Mansen, who lived in Paris, and in 1855 had sold his collection, which contained almost all the postage stamps issued by that time. The stamp merchant and second-hand book dealer Edard de Laplante bought it, recognizing the definitive collector's worth of the postage stamp. Due to the boom in popularity and news of this transaction, stamp merchants like Laplante began to emerge.

Towards the end of the 19th century, stamp collecting reached hundreds of thousands of people of all classes. Some countries