The Slotted large flange hubs with a OIL CLIP came out in 1958 in 1967 Large flange hubs had round holes NO oil ole go Figure! these had the straigh skewer, in 1978 the skewer are curved, NOW In 1953 Three piece hubs had two row of holes one large one small. are you now confused? I am, Cheers john Crump OldsquareoledBrit, Parker. Co USA