The saw is an interesting one, however I can't say much about its history. Bought thru ebay, the seller himself referred to a previous owner in text of the ad. And that's all.
Here is how the saw looked like on arrival, the decal on the sprocket cover was partly faded but read "DOLMAR 120si" as well.
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And this is the S/N plate in current state. Apparently it has suffered from cleaning.
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Compared to your 116si plate it looks somewhat "hand stamped" but then again the layout, quality and number of items shown on the serial tags have that often changed during production, I wouldn't dare to draw any conclusion concerning this saw's origin.