I'm sorry I don't have a logo. What kinda of Keystone do you have? do you have a picture you could post? I have a 1973 Keystone Deluxe. As far as I know the Deluxe models didn't have a logo, they just had "Keystone" on the back of the seat. I believe the models that had the 2-stroke TAS engines had a yellow K that looked similar to the old K that Kawasaki used.