Interesting Washington

[g8rdmd]

Hey All!  First time poster here with an interesting coin to throw into the mix...  Got this from my grandfather about 20 years ago.  1971-D Washington quarter with the reverse in copper.  The coin is definitely lighter (by feel, I haven't weighed it) than a standard Washington.  What do you think?  (Still working on my numismatic photography skills....).

[Mark T]

The coin is missing its clad layer. This is considered an error coin however, I am not sure of its value.

[g8rdmd]

Cool!  Thanks!  I'll have to do some research to see what I can come up with.