Moderator's response: We don't see why this one should be in framebuilding, sorry.

Framebuilder's response: I wouldn't ride it and there is no way I would spend money fixing it. Really hard to add filler to a rusty gap in an old fork. If you really want to know if there is a problem, get that area sandblasted. I used to keep myself in beer money back in the '70s fixing improperly brazed French bikes, so my guess is it was made after lunch. I wouldn't have touched this one though.

I wouldn't expect movement with a partially brazed fork blade. At least not until the fatigue crack moves through the good filler. It might never happen, it might happen the next time it's ridden, you never know.