G. Piprot, 2, rue d'Amsterdam, Paris

La société L'Atelier d'art photographique also operated from this address and seems to have been a Piprot enterprise originally. (See here under the IRIS logo). Later Piprot moved to 37 rue Vauthier, Boulogne-sur-Seine. His marques were an early GPL monogram, "ÉTOILE" and a single black or white star. Cards with the text GP marque form a big series probably not intended to be posted; the directory enrty for 1901 show that Piprot was the concessionaire for this series. Piprot registered the name "émaillographie" for a photographic process used on some cards.

There are other GP Paris marques of this period which don't appear in the directory entries but which are presumably Piprot, viz with the basket of flowers and with the anchor.

His firm also produced cigarette cards and according to Wiki used a mark consisting of a star with trailing comet tail. Though I haven't seen this, it suggests that the "shooting star" card below may be an Étoile production.

In 1903 Gaston Piprot was president of the Chambre Syndicale de la Carte Post Illustrée, and he remained a vice president for many years.

There is an article on Piprot here on French Wikipedia.

Piprot has an entry in the 1913 and 1914 directories but the Etoile marque is shown under the Fargeon name as exclusive agent. During the WW1 visé regulations many cards show that they were printed by Piprot, or by Établissements photographique de Boulogne-ser-Seine, which must have been a Piprot business. The demand for cards boomed and a number of new publishers started at that time. Publishers with Piprot print lines include Dix, E.M., JM, MJ, Rob and Suzy. These marques often have different print lines on different cards,

By 1921 the card business, with that of E David, had passed to A Monod, who advertised just the marques Dix, Diane and Idole. See the separate entry here for Éditions Lafayette, eg under the DIX logo.

By 1925 a slightly tilted star became a marque of A.M.Weiss (Spécialités pour l'exportation, Beautés, Enfants, Amourettes, Décolleté, Fantaisie) at 28 r.Dechabrol.

from Annuaire Illustré des Fabricants ... Paris ... 1901
from TOME 2, LE TARIF DES DROITS D'OCTROI DE PARIS ... 1907
from PROFESSIONS DES COMMERÇANTS ET INDUSTRIELS DE LA VILLE DE PARIS 1914
from PROFESSIONS DES COMMERÇANTS ET INDUSTRIELS DE LA VILLE DE PARIS 1914
GPL 12. (Madge Lessing, principal boy in Jack and the Beanstalk, USA, 1898)
GPL illustrated example
GP Paris 24-287
GP Paris with basket example
GP Paris with anchor example
Étoile advertising card 2
VBC SERIE NO 3012-2
émaillographie (Walery is the photographer).
(Shooting star) 204, possibly Piprot