The Czech site from which this page is derived gave the model as "MX", which appears to be an error. The machine pictured is probably a GM, of which there were three models, each powered by a different engine: Moser OHV, Zurcher OHV and JAP SV. This appears to be a Zurcher.
Specifications:
250cc four-stroke engine
3-speed gearbox Campbell
pressed metal frame
special fork
balloon tyres
Chain-transfer chain
