Superbe ! 1937/1939 DKW built in 250 and 350
The tank makes it a SS250 1938-39, non ? Link to "www.dkw-motorrad-club.de"
In the movie it's a imaginary motorcycle brand called 'Salama'. Same "R" on the block than /vehicle_804785.html . Looks a bit like the Rudge too (block, exhaustion pipes and other items). Rudge Ulster
Imaginary motorcycle brand 'Haukka'. Royal Enfield but
yes, Royal Enfield http://kampiveivi.fi/ajoneuvot-elokuvassa-kyokin-puolella-1940/ due to this page of the movie