7 de Julio San Fermin Peña club / Los del Bronce Peña Club / El Bullicio Pamplonés / Donibane / Aldapa / Alegría de Iruña / Anaitasuna Peña Club / Armonía Txantreana Peña Club / Irrintzi S.C.D.R. / La Jarana Peña Club / Muthiko Alaiak / Oberena / Rotxapea Peña / Sanduzelai / El Charco S.D.C.R / La Única / Mutilzarra Peña club /
The first documented evidence of the existence of this Peña date from 1913, although there are those who believe it was founded in 1903. The Peña was originally founded by a group of youths from Guipuzca. They paraded with a banner which read "Los de siempre" (The permanent ones). Consequently, La Única is the oldest Peña in Pamplona. In fact, the name suggests that they were the only group that paraded during the fiestas to liven up the fiestas.
At the time this was not a customary habit in Sanfermin or outside the fiestas, but the people liked the idea, although the authorities took a dim view of it. They used brass band instruments, which we now call "txarangas" bands. At that time it was usual to go around with guitars and lute-type instruments which made less noise and these groups were against the idea of brass instruments. This Peña dress in green sashes and neckties and wear the old-fashioned "alpargatas" footwear. It is thought that the green comes from the original flag of Pamplona. They also have a smock of small blue and white checks.
Little by little other Peñas were formed and the ambience took on the color that today still remains. During the 1940's they organized weekly dances in their premises to get money for the club, which was popular in the city at that time. Later the Jarana Peña club would do the same. In the 1970's this Peña opened its doors to new members and it was the first Peña to have a woman president, who also became the spokesperson for the federation of Peñas.