Marbles tang sight for win. 1873 are on sale at Brownells for 79.99. Specs are the same as for the Henry h001, hole spacing,height and angle.
I mounted one on my Henry and what a great sight. The only thing I would change is the outside diameter of the aperature. Too large for me but oh well you cant have everything.
I did order the screw set for the Henry as it is different than the Winchester.