I thought this was the only known WP #314 'So ソ under a Roof' marked roller when I acquired it.  Since then I've seen two more sold on eBay by Woody.  Still 3 marked rollers is pretty rare. 

The seal button is a little chipped up but the mark is clear and complete. 

This is a near mini jumbo roller that's a light green color.

Found on Hokkaido Island, Japan.