I used to have a Weston Master V, but I don't recall it being marked with anything but ASA speeds, but it might have had DIN (German) speeds, too. The old ratio of DIN to ASA was a log-like conversion, I believe, where 14 DIN was 25 ASA, 17 DIN was 100 ASA, etc. The current ISO standard changed the method by which film speeds are lab tested. I'm not sure if there's a direct ASA:ISO ratio.