Moto Grand Prix
Join Date: May 2004
Location: Baja 'Bama (Panama City, FL)
Have you looked at the inside of the tank? I'm thinking it was a patch. Especially since it is right where a 'drop' would damage the tank.
It's a goner, no matter what the cause.
There has been an 'Aluminium Silver' one for sale in San Diego (asking $75) for at least a year. Shipping to SC would be a bear, though.