Hokusai dating?

Comments:
: Hi, : I got this with a group of other prints (shin hanga) and this is an artist I don't know much about. In particular, I have no idea : what the seal on the back signifies. Any help? Is there any means of dating this print? Is it a later reproduction and how do you know? Thanks! : : <img src="http://www.hanga.com/images3/hokusai-fuji.jpg" width=700 height=485> : : <img src="http://www.hanga.com/images3/hokusai-seal.jpg" width=147 height=146>