Ok ... I admit to being somewhat of a neophyte to vintage machines, so when I saw this machine I thought "Ok .. what is a "blackside" Singer 15". All Singer 15's were black (to my knowledge). I searched ISMACS thinking perhaps Blackside was a factory. Nope.
http://www.ebay.com/itm/VINTAGE-SING...item19dae9588e
Then I saw this ad by the same seller. And I laughed.
http://www.ebay.com/itm/SINGER-1945-...item19dae956d4