Name origin:

"Sinpar" was originally a French automaker that produced automobiles from 1907 to 1914.
This company produced "De Dion" cars in Courbevoie with 4½ hp or 8 hp engines.
The name "Sinpar" meant that these cars were "unmatched" or "unparalleled."
By those days, Léon Demeester and Dominique Lamberjack founded, in Courbevoie and in 1905, a company with the name "Demeester & Lamberjack".
Passionate about the competition, he puts his first models racing at the most important "grand prixs" of those days such as the G.P. of Dieppe Carriageettes.
In 1912, the brand proposed under its name cars built under Sinpar license. Finally in 1914 Sinpar absorbed Demeester.
The First World War put an end to the activity of this first incarnation of "Sinpar".

In 1946 Leon Demeester founds a new company recovering the historical name "Sinpar".
This company manufactured truck winches, transfer boxes and chassis modifications for 4×4, 6×4 and 6×6 traction. It worked for all French manufacturers until 1975, when the manufacturer Saviem took over the assets of the company.
Following the end of Sinpar's activities, "Renault V.I." created a subsidiary in Chassieu in Rhône, also called Sinpar (Societé Industrielle de Production et d'Adaptations Rhodanienne).
In addition to the trucks, Sinpar was known by the general public mainly for its 4x4 transformations in Renault cars: Renault Goélette for the Army, Renault 4, Renault Rodeo, Renault 6, Renault 12 and some Saviem trucks (SG4 and SG2).
This company played for Renault the same role that Dangel played for Peugeot (Peugeot 504 or 505). Sinpar also produced for Renault the ephemeral Renault 4 "Plein air" and 4x4 transmissions for the "Dallas" jeeps.
It also manufactured complete vehicles under its brand name: Sinpar Mini and Castor (narrow trucks up to 7 tons for cargo transportation using the Estafette cabin and Saviem components).

Source: Wikipedia

Will this Portuguese R5 4x4 be a Sinpar original?
(Found in 2016 and apparently for sale somewhere in Portugal)