Aluminum by Sometymeglide posted Feb 20, 2019 at 12:11 PM Aluminum? by Sometymeglide posted Feb 20, 2019 at 12:11 PM Aluminum? by Sometymeglide posted Feb 20, 2019 at 12:36 PM What's with this quater? by Sometymeglide posted Feb 20, 2019 at 6:02 PM
Corrosion. Some acidic chemical eroded the copper core between the clad layers a bit. That would account for the weight difference. Not aluminum and not a mint error. Just damaged.