In The Netherlands, mourning cards where first known in the 17th century. In general there were two different kind of cards: mourningcards (in Dutch "Bidprentje") mainly in remembrance of someone who passed away, and holy cards or devotional cards (in Dutch: devotie prentje) to remember someone's first communion, first mass, entrance into a convent, as a souvenir from a pilgrimage, or just with a prayer.
Image from Rijksmuseum, Amsterdam. Serie of Holy Cards from the Netherlands, 1800-1833
Vormselbewijs - Proof of Confirmation, the Netherlands 1800
Proof of Confirmation:left 1844 Gorinchem (Geertje Gerrits Hollander), right 1836 Workum (Cathrina Maria Helena van Andringa Bijvoet) - from my own collection
World Mission Day
Some of the most found devotional cards are the ones for special days given attention in every church around the country, like World Mission Day, Vocational Day.