Some of the factory finishes weren't always perfect. I own and have owned several pre 64's with light sanding marks and even small runs in the lacquer. I've seen this less on M70's and more on bolt rimfires of the time, but I have M70's with these blems as well. They were never made to be collectors pieces, but built by hand. The advice given about handling as many known originals as you can is the best way to know what you're looking at.
