I've just been poking around on the Marble Arms web site. I don't know any details about these sights yet (such as will they fit the barrel slot on a new Win 1895 properly, what height would be needed, etc.) but they look interesting.
Sporting Rear Sights
Sporting Rear Sight is available in over 20 various heights from .275 inches to .630 inches.
http://www.marblearms.com/rearSights.html#95 Folding Sporting Rear
http://www.marblearms.com/rearSights.htmlBullseye Sight
http://www.marblearms.com/bullseyeSights.htmlCheers!
-Bob F.