There could have been a slight difference in the specific formulation of the chrome-moly steel, or the process of working the Infinity could have been a little more expensive (more likely). I believe Tange positioned Infinity as slightly above 900/1000. TANGE PRESTIGE VINTAGE MTB FORK 1 1/8' 6 7/8' STEER 26. There is a difference between Infinity and 900/1000 - they are both chrome moly, double butted, and seamed - but the butting on the Infinity is a little different - they call it 'tapered butted' and the transition between the thicker and thinner parts of the tube is smoother and a bit more gradual. TANGE TX-500 BMX FORKS 80s Tan NOS OrNICE Restore.ThreadwearFit Mongoose GT etc. Nevertheless, I've seen posts on forums where people say they could still see the seam (when looking down the inside of the seat-tube, for example). If I recall correctly from old magazine articles in the 80s, Tange felt that their process of working Infinity made it virtually the same as seamless - hence the name 'infinity' - no beginning, no end. However, I found many other references to Infinity as also being a seamed tubing - numerous posts on forums, as well as this article from Sheldon Brown's site: I believe that it may have been part of Tange's marketing plan with Infinity, to downplay the fact that it was also seamed tubing.
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