Pewter/Lead Impressions Of Medals

hi
I have three of different medals in pewter/lead . From two , there exist effectively a medal , from the third not . I was searching everywhere possible , but found nothing . My question is : why these impressions in pewter/lead are made ? Was it a test to control the result or were there other reasons ?
The medals are from an artist of Bruges (Belgium) :De Hondt ,1786-1869 . I have almost all the medals he made ,but there is still a big problem of identification with the third one .
Albert


obv:royal school for useful and plastic arts in 's Hertogenbosch (the Netherlands) , a wild man with the shield of the town ; At left an orange tree as symbol for the king of the 'Huis van Oranje ' ,made in 1828 wenn the Netherlands and Belgium formed one country ( until 1830))


obv : allegory of the province of Western Flanders with right the shield of the province and at left the Belgian Lion , made in 1842/1845 (discussions) but still used in the 20)century as price medal.This one is in lead .





second price medal in a competition for the improvement of the cattle





another project foor the same school ,here with an allegory - Minerva - of the town and the shield , after her an orange tree .Unknown medal , I will come back later on this copy by comparing it with other work of the same artist .