Oct. 14, 1865 Singer Treadle Sewing Machine

According to the serial number, (138910), and Singer, this Treadle sewing machine was made in Glasgow, Scotland on October 14, 1865, and is one of the first 700 ever produced. The sewing machine itself is original and untouched, and yes, it does still work. The wood of the base and cover box have been refinished professionally by hand from a Custom Woodshop, (The Keltic Woodshop), of Kansas City, Missouri in 2004. Everything else is original and untouched and works perfectly.
I have been unable to obtain it's worth after many many attempts to do so. Any legitimate ideas would be greatly appreciated.
UPDATE: After much searching and research I have found that the wood of the table top, cover box, and the single drawer I failed to mention before, are indeed original, but as previously stated, have been refinished. This information has been verified by a second party as being truthful and accurate. The model number is 134910. Being able to verify this information was extremely difficult, to say the least, as Singer has no records of Serial or Model Numbers before 1870 and no longer speculates on the age of a machine before this date as to when it was produced.
Thanks to those who have tried to help. The information was much appreciated.