A nice example of a bonding error. One clad layer on the planchet separated before it was struck. This coin happened to have the copper layer exposed on the obverse when struck. The coin weighs 4.67 grams, or about 85% of a normal quarter's weight of 5.67 grams. The details of the coin are weak on both sides due to the missing metal mass in the coining chamber.
The definition of this error from Error-Ref.com
Quote: One clad strip was not properly bonded to the core strip by the bonding mill. This caused the clad layer to separate from the copper core after blanking but before the coin was struck.
I also have a 1999-P Dime with the same error.
"Shine, shine, a Roosevelt dime All the way to Baltimore and running out of time" - Tom Waits 'Clap Hands'
What does the edge tell me? That the stock material was cut with the obverse side up (the side with the missing cladding) How do I know this? The copper color is longer from the top. If it had been cut from the opposite side, the silver color on the edge would show a longer silver color. Note on these quarters:
The longer gray edge is cut from that top/bottom of the planchet. Thinner gray color is the bottom of the cut.
Quote: Here's a shot of the edge. It's almost all copper with only a little of the clad layer showing.
What it tells me is that the clad layer that came off was the layer on the bottom side of the strip as it went through the blanking press. And as Coop points out that side was facing the obv die when it was struck.