Vintage road bicycles are pretty fragile steeds, when compared to almost all other styles. Vintage bicycles are, well, vintage - which is another word for old. And old suggests use. So, if you use something fragile a lot, chances are it will go out of whack, sooner or later?
My experience has been that the better bikes are usually OK. Entry to mid level, look closely. And, of course, the older the bicycle, the more likely it will have experienced trauma at some time in its life. But not to fear...
Vintage steel is pretty solid stuff and, more often than not, can be bent back into place with reasonable ease. It does help to know what you are doing, of course. Don't tie your frame set to a tree and have at it with a two by four lever. Nope, ya gotta watch out for those trees. The two by four is OK, though and I am serious.
I am the guy that pointed out the bent fork. A fork does not have to be bent noticeably backward to qualify as bent. Sure, it is important to look, squarely, at the fork from the side, but look also from the front.
When looking from the front, consider the position of the wheel rim between the fork blades.
Does it split the space evenly? If not, chances are the forks are bent. Look at the one picture of the International and see how close the rim sit to one of the fork blades. Does that look right to you?
Anyway, that is my opinion on the subject. I have offered this same opinion,
in greater detail, in case anyone is interested.