Help for the Stupid

[meid]

I recently bought a bottle of wine at an estate sale of a wealthy, elderly, woman and I am trying to find out some info about the wine. There is no age or date on the bottle but is from the vinyard of Paul Masson, in Saratoga, California. It is listed on the label as California Madeira. Under the label it says Medium dry, Nutty, Mellow.

Can anyone tell me what kind of wine this is, is it worth anything, is it worth saving, or should I open it and see for myself?