Like many passionate craftsmen of the 1950s, Monsieur Perrin, a Grenoble motorcycle builder, constructed his one-off "Spéciale" around a modified production engine, so he could race at lower cost. This motorcycle was built by Mr. Perrin (Grenoble) around a modified JONGHI 125 Type D engine.

From the early 1950s, the Jonghi Type D became a fixture of motorcycle competitions. Introduced in 1948, this little machine would become one of the most prestigious racing motorcycles. The mechanics of this 125 are incredibly modern and efficient: the single-cylinder engine with external flywheel appears very conventional, but it actually features single overhead camshaft timing driven by a train of gears. Moreover, the gearbox and even the crankshaft can be removed from the side without taking the engine block out of the frame! The machine quickly made a name for itself: Remondini, a works rider, set 8 world records on it!

This unique example finished third at the 1956 Bordeaux circuit. Other riders would make a name for themselves at the handlebars of a Jonghi, such as Jean-Pierre Beltoise.

• Engine: JONGHI 4-stroke, vertical single-cylinder, 1 OHC (overhead camshaft), 2 valves per cylinder, air-cooled — displacement 125 cm³ — bore x stroke: 54 x 54 mm — power: 12 hp at 6,000 rpm
• Overhead camshaft driven by a train of gears.
• Battery-coil ignition.
• 4-speed gearbox with right-foot shift.
• Frame built by Monsieur Perrin, modeled on Norton Manx racing motorcycles. V
• Front fork: PUCH
• Front hub: PEUGEOT Bol d'Or; rear hub: JONGHI
• Fuel system: 1 Dell'Orto carburettor
• Transmission: Multi-plate clutch running in oil bath, 4-speed gearbox, final drive by chain
• Suspension: Front: Puch telescopic fork; Rear: swingarm with twin shock absorbers
• Brakes: Front: twin leading-shoe single-cam drum; rear: single-cam drum
• Top speed: Approximately about 93 mph, depending on gearing