Thanks for the comments I'd originally planned on putting both heads on the new hafts, but the 1lb head had been wedged with a huge nail and I had to saw it down. Seemed a shame to waste what was left of the old haft, so I rehung the smaller head on it. I'm gonna have to redo the 1lb, totally ballsed up that hang. Not centered, too high on the haft, managed to crack the wedge etc etc. 1lb head is a Skinner & Johnson #5, which puts it at at least 50 years old, and the only marking I can find on the 13oz one says "J&C".