Shaker Double Rolling Pin

I know it's authentic. I sent pics to Hancock Museum in Mass and spoke
to curator. His quote was "Now I know of 2 double rolling pins". He
asked if I would be willing to donate it for a tax write-off.
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Only 3 out of 10 Shaker museums have 1 on display, so I know it's rare, 
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My problem is there is no record of 1 ever being sold. I got it while
living in CT in 1958-59 but didn't know what it was until I saw HGTV
Shaker Special. I was able to track it back to approx the mid to late
1800's.  
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I would like to sell it, but not sure how to go about it. Has there ever
been a site set-up to sell only 1 thing, and explain it's on a "Make an
Offer" basis? Any suggestions would be helpful.
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Thanks in advance, Bonnie