Can someone tell me the brand of this helix

No makings or engravings. Just trying to figure out what brand it is so I can order a Dalton helix and end up with the same one.
 
No markings anywhere. Only thing that is stamped on it is the angles 52/36. And it measure pretty close to that.
 
That looks like it. Now can someone tell me how close the degrees are to a dalton?


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