English 25.4 x 24 thread. Fits 22.2m quill stem, 30,2mm inner diameter head tube. Lower cone diameter 26.4mm.
Stack height (with 2mm tooth washer) 42.3mm, please see explosive diagram as pictured. Ball retainers x 2 are included, no manual or explosive diagram is included. The item "Shimano 1975 # K-901 Dura Ace Black finish B. C 25.4 x 24 thread steel head set" is in sale since Monday, April 26, 2021. This item is in the category "Sporting Goods\Cycling\Vintage Cycling\Vintage Bicycle Parts".
The seller is "casanova9898" and is located in Profondeville. This item can be shipped worldwide.