This stock is getting extremely difficult to value with the Yen/dollar price fluctuations. It was the 8th worst stock out of the Nikkei 225, losing over 4% last evening. Taking the current price of Y97.64, this stock's price of Y1590 would be $16.30. Let's hope it has a much better evening tonight!
Also be aware that there is a video with CEO Kazuo Hirai stating that the weakened yen against the dollar doesn't not effect Sony Corp. He did state that the weaken Yen against the Euro however would be of benefit to the company.
The yen has gotten stronger over the past few trading days, but I expect it to continue its weakening path/pattern very soon.