The fluted radiator makes me think this is perhaps a Daimler ?
It looked like a Daimler Limousine to me.
My two cent,
Similar long wheel base Daimler with bit sticking out the roof last seen in 2000-something looking rather sad perched atop of a container in 橫台山散村.
I think I took a picture of it, but can't find it now.
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