To answer your question, you could probably get $20.00 plus $5 shipping for them as they still function as iron sights. If it were me, I'd oil and bag them with whatever original documents you have still with the gun and if you or your heirs ever go to sell the gun the original sights can go with the gun so any purist buyer is still interested. I generally do that for all factory parts coming off of production guns in my own collection. If it's a parts assembled build then the parts go into the spares storage unless they aren't serviceable. Since this is the gunsmith forum I should note I'm not a gunsmith, nor do I work on other people's weapons. If I did take a personal gun to a smith I'd expect to get all the replaced/removed parts back, even if they were broken, unless we had some sort of agreement in place that payment for the work included the parts.