I have an oval platter signed by R.K.Beck,what is it worth?

I found this platter buried in my yard, intact, it was on a plate hanger, which I removed due to a small pressure crack, other than alittle chipping around the edges, she is in fine shape. I would like to know it's value.

"The platter is signed by RK Beck, the famous 19th century naturalist artist" For the rest of this article see:

http://www.rubylane.com/shops/brendastreasures/ilist/,id=0.html

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