Thank you both for the valuable information! I was guessing/hoping it had no affect on it's structure and that all makes sense what you are explaining. If I were to list it, it definitely wouldn't be like new condition, but perhaps good to very good I guess. The lines are only noticeable if you tilt...

Hello, I don't have many good photos, but am wondering how serious these lines are on my Parker. It's really hard to capture them in the light. There is a single line that goes through the entire center of the body, front and back, and there are several more striations going the same direction below...