Watch List notes:

France, Louis XIV (1638-1643-1715), bronze medals (3), all 1667, by Jean Mauger, second older head r., Capture of Oudenaarde; the rout of the Comte de Marsin [Marchin] and the Prince de Ligne, near Bruges; the Paris observatory, each 41mm. (Divo 98, 100, 103), nearly extremely fine (3)
The Paris Observatory was built with the Paris Meridian running through the building, the line on which all French navigation was to be based.

Estimate: 100 - 150 GBP