XS Sights makes a taller replacement pin-in front sight blade for Win 1895's - but it's not a "classic" look, as it's a Patridge sight with a vertical white stripe on the sighting face.
It comes undrilled & w/o a pin - so you must clamp it in place to drill a new 1/16" hole through the ramp's pin hole, and reuse the old pin.
The sight's number is: *1-WI-0017-4-
http://www.xssights.com/store/rifle.htmlThe white stripe could always be blacked out, if not liked/wanted.