I kinda thought that may be what it was for but wasn't totally sure! That cain sure is sharp though.
That chain was called a barracuda chain, and is .404 pitch on that saw. At least mine was. You won't like cutting with that chain but it's easy to convert the rim sprocket to 3/8's pitch and you can remove the sharpener easily with just a screw or two.
You may want to change that roller bar out also, as they seemed to use a oddball drive link count with 3/8's pitch chain, besides since it's all bolt on you can always put it back to original if you want to later.
Here is my Dayton, like yours's