It stripes on my helmet are orange on the back and fade to yellow on the front. My guess is that they were originally orange, and as he got beat up, and paint faded, the front ones lost their orange tint and ended up fading to yellow!
Sure. That would make more sense. I'll paraphrase John Wesley Hardin, a gunslinger from the old west; "I've killed over forty men, not counting Wookies or Tuskens." Just like the "good hits" of a football player, I think only the worthiest victories would be displayed on the helmet to avoid covering it with every little accomplishment.
hmmm of course if that was the case how could Fett get 4 extra BIG ones in between ESB and ROTJ if it took him an entire life to get 14 then I am going to bet it won't be easy for him to get 4 in that short time.
Maybe the stripes are the number of Jedi Kills he has taken in his life. We all know Boba has a major hatered for the group of people who killed his father... Just my Thought... Besides it took Boba almost 6 months to get from Cloud City to Jabba because of the other hunters after him and the Rebles after solo... He could have bagged a few more jedi in that time... Even Failed Padawans would be target...