Japanese Platter hallmark ID help

[sandrews58]

Good day all, I have just aquired a Japanese Silver Platter and am hoping somone can help me ID the markings on the back. I have ehausted all my resources and have not been able to find the info on my own, also would love to date the item if possiable.
Thanks in advance for all help.
Links to pics listed below.

http://www.flickr.com/photos/10604399@N08/3728659991/" onclick="window.open(this.href);return false;
http://www.flickr.com/photos/10604399@N08/3728659801/" onclick="window.open(this.href);return false;

Steve