Hello everyone. I own a 1986 Maruishi Record, and noticed something after the purchase that does not bother me terribly, but I'd like some other opinions on it none the less. Looking at this picture, it would appear the bike has suffered a frontal collision at some point. This is because there's a noticeable bulging on the bottom of the down tube at right before the butting to the head tube. The fork appears perfect, though most likely replaced. Here are a couple pictures of what I'm describing. I know it appears to be obvious, but I was wondering if there could be any other cause to this down tube bulge, besides a frontal impact.