Well, to my great surprise, I noticed that John Mottishaw and Classic Fountain Pens (www.nibs.com) has Sailor Mosaics back in stock in all four colors (Red, Gray, Green, and Brown). My favorite is (and always has been) Red:

In fact, in some of the pictures, they look like colorful versions of the Sapporo (with the squared-off cap).


If you have been looking for one of these (or didn't know you needed one until now), here's a link:
http://www.nibs.com/SailorMosaicsPage.html
I won't be kicking myself anymore -- I ordered one with a custom broad stub.
Mike