Condition is all important when it comes to the value of daggers, even full Rohms. If yours was the one I recall it was pretty well thrashed. I would tend to agree with Grumpy about the value. In my opinion the dagger would need a total restoration to be presentable. You'll find that few collectors are interested in restored daggers without a serious discount. If it were me I'd jump at a $12k offer. Why not post photos of it here for more opinions?