The name Curvex was only legally used for the curved back wristwatches by Gruen starting in 1935 with first model 311 17J Precision. A fine quality seller advertised a nice long case early curved back one at a reasonable price as a Curvex. I have 3 short case Curvex and am looking for a long case version. I guess most sellers would describe this one as a Curvex. It has a curved back. But it has a good 15j not Precision thin flat movement 500 so it is not. I have read that all Gruen Curvex watches were originally dial marked only for the 17j Precision 311, 330, 440, 370. There was a 500c 15j that was a curved movement but not marked as Curvex. So I am still looking for a long case Curvex. I have a 1938 Hamilton that looks a lot like this 500 Gruen. Any other Curvex models? The plastic distorts the dial markings in both. The band is a good quality appropriate one. This is priced well under a real one. Hamilton ad derails their good rr image a little with this recommendation for a pilots watch like a Gruen Curvex with slightly curved back. New costs: $35. for long case, $200. for gold Curvex, $50. Ham. Both Gruens paid same price; Ham cost same as in 1938.