. My understanding is that Jules Lang are just importers, so the bowl had to have been made overseas, whether in France or elsewhere. Although your idea that Jules Lang might have bought them from a UK manufacturer is interesting. Haven't a clue about that though
They did buy moulds from Sowerby, Edward Moore and Percival Vickers according to Ivo's book and had them produced by Valerysthal and Portieux in France, but that was earlier than this bowl's reg. date.