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Bruno - you may be right but the S-3 had a short diagonal strut at the wing root that should be visible from that angle, as well as an upper wing radiator. The S-4 might be a better possbility, only because I don't have a picture of the land version; I suspect the same characteristics apply. This machine has a very cleanly cowled engine exhusting on both sides, which suggests a V engine. The Borell Boccaccio 3000 comes to mind, but the cowling is different and where is the radiator? I think we are still looking.
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