That threaded tip will most likely have been for a swing tip rather than a quiver tip Steven, and yes, its a standard sized thread. A good many rods of that era were aimed at general purpose fishing and that was when screw in swing tips were in and quiver tips had only just been invented (and were later superseded by spliced in or push in tips). I love swing tips - not used one for years, but used 'em all the time as a kid/teenager. They can be a b*gger in the wind but they present less resistance than a quiver tip so the bites are often far more positive - the "Billy Lane" 12" swing tips were the mutts nutts

. Dead easy to make yourself too. You need to buy a few standard thread ends, then some suitable sized silicone rubber tubing (float rubber tube) and make the tip itself out of thin dowel, or even a plastic knitting needle. I also had some heavier ones I made out of metal knitting needles which I used on canals or slow moving rivers - the extra weight to combat the flow. You just need to be careful casting as the line can wrapped around them sometimes. Also, unlike with a quiver tip, you can sit front facing with a swing tip, which can be handy if you're fishing in a tight spot. Happy days....
Just thought - Youdales in Keswick might sell such things??
or on-line from here:
http://www.leslies-tackle.co.uk/stor...ING-TIP-SMALL/