Either an Astron Streak or Sprite - in the last year or so of the Imperial units motors. I'm guessing this was 1967 or 1968 - the 1967 catalog is the first one I remember and I would've been 12 at the time.
I also had an Alpha which I did in white and fluorescent orange Aero Gloss. All these (and most, but not all, of the rockets from my first rocket period) are gone. I do still have a Sky Blazer (the original shorty-motor one) that makes me cringe to look at now and the lower part of my Constellation. The payload section drifted away after the shock cord failed shortly after I got back into rockets coming up on six years ago now.
I also had an Alpha which I did in white and fluorescent orange Aero Gloss. All these (and most, but not all, of the rockets from my first rocket period) are gone. I do still have a Sky Blazer (the original shorty-motor one) that makes me cringe to look at now and the lower part of my Constellation. The payload section drifted away after the shock cord failed shortly after I got back into rockets coming up on six years ago now.