Lettre autographe signée de Gérard de Nerval adressée à Daniel Rouy

Autograph letter signed "votre bien dévoué Gérard" addressed to Daniel Rouy. Envelope included.
This letter, simply dated "Le 12" could have been written in August 1849, if we refer to a letter to Ernesta Grisi, companion of his friend Théophile Gautier, in which the poet mentions such a discount: "Je n'ai pu toucher l'argent qu'aujourd'hui mercredi. M. Rouy n'y était pas. J'y suis allé 4 fois et j'ai porté les 10F. aujourd'hui, je ne sais pas s'il faut faire le prochain feuilleton ni comment il faut signer." ["I could only get the money today, Wednesday. Mr. Rouy was not there. I went 4 times and brought the 10F. today, I don't know if I should do the next serial or how to sign it."] (Pléiade, volume 1, letter 143 of August 30, 1849).
However Michel Brix, author of Nerval, Glanes et miettes de presse and member of the Royal Academy of French Language and Literature of Belgium, very kindly pointed out to us that Nerval signed "Gérard" rather between 1837 and 1840 and that in 1849, he signed this type of note "Gérard de Nerval".