Yes, that's a 1" threaded steerer

 This is not an older frame but one I just shipped out this week. The customer requested smaller diameter tubes and a threaded fork. I had to make some calls to get the gold headset but here's the result- a tig welded steel frame that is below 4 lbs. with a look that was popular about 25 years ago. The bike will have modern components and will be in Kansas by the end of the week.

 This fork crown is the same one I used on countless builds back in the late '90's. The brake bridge is also a popular one from that era. I had a nice time building this one, even if the sourcing for some of the bits got a little difficult. It all came together- the only thing I could not get was a gold top nut for the headset. I had to go with silver but the gold Jen Green headbadge makes up for that.