Arri Arriflex 35mm Arrimag 120/400 film magazine

This 35mm film magazine is for Arriflex 435ES camera. The magazine looks in a perfect condition and manually the film thread is smooth.
However, I haven't tested it on a running camera and that is why I sell it AS IS at a very low price.
As much as I remember the film jammed when running in a camera. Sold As IS
120 refer to meter which is the standard measuring/counting in some EU countries, while 400 refer to feet which is accepted in the USA, UK and some other sovereignties.
Magazine S/N 0933.