I used to work with a guy who restored old snow machines and had to recreate old logos from what he had which was mostly the actual piece with the logo, all worn and nasty on it. I used a photo of it to make a black and white and then filled in what was missing or damaged. from there I'd make it into a vector. I think you have a really good start with the logo if that is what you are making and I'd just work with that. if you are writing something other than the name Polaris, start with bullet as suggested and since only the letters shown are know you'll have to guess at what the rest of the font would look like