Thanks. I think that confirms my square bladed fan is original Amphicar although yours are different again. I expect Amphicar experimented with different designs before deciding on the curved edge version. From what I've read the noise of a fan comes from the air as it leaves the blades and the more that is curved the quieter it is. Does anyone out there have a very early 1960 or 1961 original car - one of those with the different horn housing - maybe that also had a square fan ?
Oh and there were those really early Amphicars with the Austin engine - there is one in Sweden - maybe that's where the fan is from ?