Never heard of "Guillia" but that looks very much like a Selle Italia "Mundialita" (specially with the suede cover on it) saddle which was installed as OEM on mid level Peugeots in the 80's. I believe that it was a step down version of the Turbo, but this one's most likely just a copy of the Turbo by yet another little known maker from Spain (Unless the "Guilla" was brand of bike and this is a Turbo based saddle made for them by Selle Italia to put on their bikes).
That's a real nice saddle, and could put a unique touch into an 80's C&V build-up.
Chombi