Start with what the Horch 10 is: a car with gasoline engine, from Horch. What it meant takes a little longer.
The story
The Horch 10 M 20 is a car that was brought to the market in 1922 by the Horch company in Zwickau. The construction was made by Arnold Zoller from Argus Motoren in Berlin. Their owner Moritz Straus held in the early 1920s, the majority of the shares of the Horch company.
The vehicle had a front-mounted 4-cylinder inline engine with flathead engine and 1.6 liters capacity. It developed 35 hp at 2000/min. The rear wheels were driven over a 4-speed gearbox with shift lever in the center of the car. The car with U-profile frame had leaf-sprung rigid axles and was as four-seater touring car or city-coupe available.
What is underneath
The engine is gasoline engine. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Its place in the line
Nearby in the Horch catalogue sit the Horch 853 Voll & Ruhrbeck Sport Cabriolet and the Horch 670.