Originally Posted by
r0ckh0und
Thank you all for the responses thus far.
I did not see anything on the steerer except 4J. Upon closer inspection I now see the Columbus dove logo as well as TANGE MADE IN JAPAN. I also see 5 helical ridges inside the fork crown.
I've never seen a steerer tube with both the Columbus dove logo and 'Tange Made in Japan'. The 4J indicates October 1984 for Tange and would have me leaning towards Tange but you say there are only five ridges inside the bottom end of the steerer tube. That would indicate Columbus, as Tange used six ridges. This is definitely conflicting evidence and I'd appreciate pictures.