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@dbr
Ignore the 1" thing. It refers to the headset and has nothing to do with the BB.
As the threads on your frame go opposite directions, it probably has takes British BB (Italian BBs have two reverse threads). This is the only bit of info you need to choose the BB, the width of that BB is reliant on your chainset choice. If Stronglight recommend 119mm, get that.
To make sure, measure the width of the BB shell. 68mm or 73mm is British, 70mm is Italian.