From what I understand, of the 64,000+ "Bug" Q's produced, somewhat less that 20% were plain edge. For that reason, they are harder to find than the serrated version, but still show up for sale on eBay and elsewhere quite regularly. I also believe that PE first generation Q's (with the 3D handle and no cross pin) are less common than second generation ones. PE ones in colors other than black are very uncommon.