Premier Muguet by Bourjois is a bit of a mystery. The nose behind it is listed in many places as Ernest Beaux, creator of the legendary Chanel No. 5 and Chanel No. 22, among other Chanel fragrances. Bois de Jasmin has a wonderful post about him, which is mostly in his own words, a magazine article he wrote about perfumery, translated from French. M. Beaux created a few perfumes for Bourjois (a cosmetics house whose early, but not first, owners were the Wertheimer family and which was sold just last year to Coty), including an early favorite and perhaps their most famous fragrance, Soir de Paris, or Evening in Paris. He is supposed to have created Premier Muguet for Bourjois in 1955, during the same decade when others were creating muguet fragrances like the legendary Diorissimo and Caron’s Muguet du Bonheur.
UPDATE: the master and perfume legend Luca Turin, now blogging on WordPress at perfumesIlove, sent me this information which he kindly solicited from perfume historian Will Inrig: that Premier Muguet was in fact created in 1955 by Henri Robert, the nose behind Coty’s Muguet des Bois, who had recently joined the house of Bourjois-Chanel (they were jointly owned at that point). I have a small bottle of what I believe is the eau de cologne of Premier Muguet, full and in its original box and bottle.