i would hazard to guess based on my experience, any complete correct sandcast, not restored, not rusty should be worth minimum $15k. a moderately early LH horn vin such as yours if it is complete, correct and restored, say to the level of some of the more restored bikes you see in the Gallery, to my way of thinking should be worth no less than $25k. Of course, actual sale price depends on all variable being in place, but i don't believe my values are out of line.