Perhaps you could (a) turn the plug the other way around, or (b) flip the blade around the other way.
It is worth a try...
The flippant answer is that your saw has become Dominicanized...welcome to the DR.
The more carefully thought and reasoned answer is that the polarity of the outlet is reversed. Is this a really old circular saw or a newer model with one prong on the plug larger than the other?
if this is an ac motor, how does turning the plug around change the spinning of the motor?
They are still around. My nephew has one in his furniture shop in Tenn.