Depression Glass Diamond Block Sugar and Creamer, Green

This green Depression Glass footed sugar and creamer set is in excellent condition (no chips, cracks, roughness, etc.) and the sugar has the Imperial sticker attached, but the Imperial experts tell me they are 99% sure this isn't Imperial (they have seen it before, but can't remember the name/maker). It has a diamond and block pattern (it is not the pattern known as Diamond Block, nor is it Quilted Diamond), very similar to Jeannette's Windsor Diamond and Cube/Cubist (in design and color, so I suspect this was made by Jeannette), but I haven't identified its maker, name, or line number. If anyone knows, let me know! Each measures 3" high and 3 3/4" across, has 3 feet and holds 4 oz. comfortably.