I'd be surprised if it's anything other than the standard 22mm but......
My SOP with unknown cranks is to try to screw in a 22mm by hand - if it was a really sloppy fit then I would try a TA and/or a Stronglight (when I had one). Back in the day when the place I worked sold Aerospace bikes I used to have a remover for Lambert cranks as they were a really weird Imperial size. Don't know what happened to it or the Stronglight one.