I've got it soaking in Barkeeper's friend now - upside down so that the Fork blades don't fill up with water through the air holes near the drops - there is a little thread missing in one spot, but the rest are ok. I'm slightly worried - having the local bike shop chase the threads is a good idea. Thanks for that - I was thnking about just chasing them with a steal nut from an old headset...

I am hoping to find an old Magistroni Senior headset to go with the frame - I thnk it's age-appropriate and should cost less than Campagnolo from same era. Anyway - probably doesn't need to be too tight - so I should be ok - otherwise, this one goes off to Joe Bell too...