This same stairway appears in Cavalcanti's Rien que les heures (1926) and almost thirty years later in Dassin's Du rififi chez les hommes (1955). In the interim a central handrail has been added, and the wooden fencing replaced with railings.
By my rough calculation there are about forty steps.
Rien que les heures is not sufficiently localised to give a clue as to whereabouts, but in Rififi the context strongly suggests Ménilmontant.
In the credit sequence of the Ménilmontant-set La Maternelle (1949) there is a view of this staircase, which seems to me conclusive:
By my rough calculation there are about forty steps.
Rien que les heures is not sufficiently localised to give a clue as to whereabouts, but in Rififi the context strongly suggests Ménilmontant.
In the credit sequence of the Ménilmontant-set La Maternelle (1949) there is a view of this staircase, which seems to me conclusive:
The poster for La Maternelle appears to show the staircase from the other direction but doesn't supply any identifying features: