I believe I know who this widow is. Thank you for helping her with the table.
The best way to sell it would be to put it on the usual sites (including here) and be prepared to lower the price until it hits the market value, whereby it will sell. This sounds simplistic, but the value of anything is tied to what a qualified buyer will pay for it....not what someone else believes it is worth! ( similar to what drbond stated above..and which is great advice!)
Also, keep in mind that the table referenced above is for sale in the UK, which may have something to do with why it has not sold-- so far.( shipping costs, customs etc.,) ( or not??).