Its a 120 for sure, and I live far out in the norskie boondocks, no proper camera store in sight any more....
I raided the local dig. cam peddler a week ago, acted on a tip and found a fridge half fuyll of 120 film, of which I secured half (on the managers order via mobile phone "only sell HALF of it!"), but that was 200ISO, and color to boot.
Color is no problem, I routineously develop Gold 200 in Caffenlo-C to B/W, works like a charm, but if Caffenol doers anything, it enhanches the ISO, its closwer to 400 than 200, so maybe a solution would be to find a real fine grain developer, which is bound to loose 1 - 2 stops and give me a perfect simple camera film ISO??