Cracked Headtube - repairable?

I wouldn't even consider doing anything with that, other than cutting it up and chucking it in the aluminium recycling bin.
 
Iron horse are a well known brand although i dont kno wmuch about that frame specifically.

Id probably say it is better than your (newer) cracked db frame.
 
I wouldn't contend repairing that frame. You don't know what forces resulted in that crack and where else in the frame the rest of the energy went.
Teeth breaking candidate imo
 
I wouldn't bother. Theoretically you could weld it, but you'd need to re heat treat and shotvoeen the whole grange again to restore the structural integrity.
 
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