The dial is also in DIN with 24 25 26 27. On the normally accepted scale that is 200 (24), 250 (25), 320 (26), 400 (27).
Your calculations assume the progression in ISO is arithmetic, when in reality it's geometric. A one stop increase is always a doubling of the Iso/ASA.
The closest you'll get to 325 is 320 Iso / Din 26.
Leica M2, Nikon D700, Bronica RF645, Leica CL, Summicron 40mm, Rolleicord Va, Hasselblad 500 CM Zeiss Planar, Leica 50mm Summicron V3 - all gone.