Sandcast 1928 / E2010 is listed on eBay. Looks to be mostly all there with original paint on the body parts, a repainted frame and top-end rebuild. I do wonder about the paint job on the frame. Looks like it was not prepped very well, if at all. It appears to me that someone attempted a rather amateur restoration some time ago. Also, the shocks look like the aftermarket replica shocks from Z1 Parts. The add claims that the bike has original un-stamped exhaust. They look almost too good to be original, but that's the claim. Would those be Lotus roots? Overall, it is a low mid-number sandcast with reasonable mileage and lots of potential.
