I strongly suspect a custom (most likely 'homemade') font made from the user's own printing. Such fonts are so easy and cheap to make that this hand-printed style is often a waste of time to locate. I have collected many hundreds of fonts like this in Part 11 of the Script Font ID Guide, but I don't recall this being one of them.

However, I did some checking after posting that reply, since you had a name for the file. Guess what? There is a hand-printed font called Newton. It was on a freeware site that I found with Fontseek. The font file only names Fontographer, so I have no idea whose work this is, or even whether it is the true name of the font, so user beware.

I guess I have a new addition for my Guide.