I think you are right on with your assessment. The paint on the the chrome tanks is always weaker and more vulnerable to damage. The clear part of the decal gets crispy and flakes off, taking the weak paint with it. Now, I'm still not 100% sure Schwinn didn't slap this "Tornado" style decal on at the factory at some point on Phantoms. I have seen a few over the years that looked original and were from non-bike-guy owners. But, I'm going to consider it a replacement until I can prove otherwise, which may be impossible....