I have no image of a Zugaza logo, so I have used a Basque Flag – the Ikurrina – via Wikimedia Commons.
Daniele Schirmo aka Frankie688, CC BY-SA 2.5 https://creativecommons.org/licenses/by-sa/2.5
Hijos de A Zugaza S.L. of Durango (Vizcava), was a company with diverse activities including the sale of spare parts and accessories for automobiles. In 1952 it became involved in the manufacture of auxiliary engines for bicycles, having purchased the rights and design of the Colibri brand from Alberto Bonelli.
They offered the first 48cc (47.75cc) engine under their own name but quickly renamed them as Galgo which, in 1953, would be increased to 56cc and would remain in production until 1956 when demand for auxiliary engines waned.
This example of the Galgo auxiliary engine dates from 1954 and drives the rear wheel by chain. It is part of the extensive collection of auxiliary engines assembled by Josep Iglesias Fabrega and on display in his Museum “Bicicletes de FOC” in Mola, Catalonia.
They offered the first 48cc (47.75cc) engine under their own name but quickly renamed them as Galgo which, in 1953, would be increased to 56cc and would remain in production until 1956 when demand for auxiliary engines waned.
Zugaza started to offer all the parts necessary to build complete bikes and the bike in the photograph uses one of their mixed type frames.
Spanish Motorcycles 