I am not sure, I do not have the VDH aluminum plate not rigged but I recall well under a pound.
A standard AL plate is about 2lbs. A lightened AL plate, like from Mares is about 1.5lbs. Ti plates have about the same weight for the same thickness as AL plates. The Halcyon CF plate is 1.1lbs for the standard size. The Chinese knock offs of the XDeep ghost (originally made for an Aussie dive shop) is less than a pound, but they are dog bone, lightened, and made out of a different grade of AL; they are probably the lightest plate you can get made out of metal. I probably wouldn't use it for doubles, but considering that people make plates out of Delrin, cutting boards, and the like it is probably good enough for single tank use.