Interesting! Granted, mine is not standard, but it is opposite, as is the other ebay entry adjoining this one, and the one pictured in Modern Japanese Swords. Those all have the mei on the omote, and the date on the ura, and do not have the railway stamp. This one is the reverse. Did all the others you checked have the railway stamp as well? Do you have any in the survey that have the mei on the ura that don't have the stamp?