u/krakenpl34se

I'm a sucker for these old cantilever dropouts, sketchy as they may be.

I picked up a 90's cannondale alloy frame to build up. I was giving it a close look for any cracks or other issues and found this sort of nasty looking spot inside the headtube.

Is this something I should be worried about? I can't see any other issues or cracks from the outside. Unsure if this is a potentially normal manufacturing defect, or caused by something else. I'm no materials expert, but am extra cautious about alloy frames and would like some opinions before I commit to using this one. Thanks!

A few pictures for my fellow steel enthusiasts

I picked up this sweet restomod cannondale a few years ago, and then it got stolen from my garage after about 3 weeks. I absolutely loved how it rode and want to find another to build up, but since it was resprayed I'm not exactly sure what model it was. Any tips welcomed! Or if you happen to have a similar frame in the 56cm range you'd be willing to part with, let me know!