Could be a mixed wood !! The top is different from the base !! Grain is wider, pattern is different !! However with this old computer I can`t see well enough to say what it is !! The pics are so large I could not load all of them !! My choices would be Walnut or Elm but when its cleaned off a bit those choices may change !! Will go back and see if I can load the other pics !! Didn`t notice the pegged construction before or it was on a pic that didn`t load !!
As Frogpatch said,, denatured alcohol is a pretty safe thing to use to remove the varnish without stripping the patina but it is pretty labor intensive !! Yes laquer thinner works too but I was not fond of the smell and takes same amount of work !! Plain old rubbing alcohol will work but the 50% dilution is not as strong and the 70% dilution is not always available !! Plus its just cheaper to buy a gallon of the denatured alcohol at any home improvement or hardware store !! You will need 4-0 steel wool and lots of old rags and a pair of rubber gloves unless you want to spend a day or two cleaning the residue of varnish out of your fingernails !! Use it the same as Formby`s and yes,, work in small areas !!