Between the windows on the premier étage (first floor above the street)
 is this charming piece of architectural detail.  
The plaque says simply "au cherche-midi"

19, rue du Cherche-Midi is a few steps away 
from Poilane the reknown bakery.  
The street traces the route of an old Roman road 
and is situated in one of Paris' most sought-after residential neighborhoods 
with its 18th and 19th century homes.

19, rue du Cherche-Midi
75006, Paris