The image shows a French medal or plaque from 1904 depicting the Hôtel de Ville and belfry of Arras, likely created by an artist named Lefebvre. 

This piece is associated with:

Arras Exposition du Nord de la France (1904): It commemorates the Exposition of Northern France held in Arras in 1904, as suggested by similar medals found.

Artist Hippolyte Lefebvre: The name "LEFEBVRE" visible on the medal points to Hippolyte Lefebvre, a known French medalist.

Material: Similar medals from this period and related context suggest it could be made of bronze or silver.

Commemorative purpose: These types of medals often served as souvenirs or awards during significant events like expositions.