hi from New Zealand.i have a 1968 cb450 k1.its the early model with small triangular badges.not a lot were produced before parts were superceeded into the more common k1 with the larger DOHC450 triangular badges.ive noted at least 7 variations of k1 models which were made till late 1969 when the K2 painted tank model without knee pads appeared.anyone interested in detail changes can contact me.as an on going quality control measure parts were superceeded continuously throughout production runs.honda was very thorough in this field.id be pleased to assist anyone wanting technical information and share pics of our lovely 5 speed k1s.regards Graeme Duckett.New Zealand