The Type 37 was established to bring the successful Type 35 chassis to the road. It used an Inline-4 from the Type 40 within the Type 35 chassis. Some cars had a Roots-type supercharger and received the designation 37A. It became a favorable car among amateur drivers, who especially appreciated the car in voiturette racing.

The car started life with a cigar-like Grand Prix body. In 1937 the owner commissioned Hanni, a Swiss coachbuilder based in Zurich, to a rebody it with a roadster design. To fit the theme set out, the gearshift and handbrake, which are normally mounted outside the car, were relocated to fit within the interior. Highlights of Hanni’s design included a smaller, redesigned radiator and an ostrich skin upholstery .

engine	Inline-4 w/Roots Supercharger
position	Front Longitudinal
aspiration	Roots Supercharger
valvetrain	SOHC, 3 Valves per Cyl
displacement	1496 cc / 91.3 in³
bore	69 mm / 2.72 in
stroke	100 mm / 3.94 in
power	67.1 kw / 90 bhp
specific output	60.16 bhp per litre
bhp/weight	125.0 bhp per tonne
redline	5000
driven wheels	RWD
front tires	27 x 4.40
rear tires	27 x 4.40
front brakes	Drums
f brake size	mm / in
rear brakes	Drums
r brake size	mm / in
curb weight	720 kg / 1587 lbs
wheelbase	2400 mm / 94.5 in
front track	1200 mm / 47.25 in
rear track	1200 mm / 47.25 in
transmission	4-Speed Manual