M&H are well known to be top quality pianos ... however age is a determining factor.
1. Tastes in cabinetry styles have changed a lot in the past hundred years. Unless this is a fairly unadorned instrument, you'll be looking for a buyer looking for period furniture (and probably not the piano)
2. Uprights are less favored than grands. Most people will opt for a new (or newer) upright or digital than an old one, no matter how good.
3. Service and tuned FIVE YEARS AGO? ... seems like this has not been a well cared for piano. Tunings should be twice or thrice a year ... you might get away with annual tunings if the environment has been fairly constant in terms of temperature and humidity.
4. Felts and leathers deteriorate over time. Pin bushings, bridle tapes, backchecks, balance rail punchings, key buttons, and more may need replacement.
5. In the late 1890s M & H were producing "screws stringers"; piano's that didn't have a wrestplank (pin block) but rather bolts and a jamming device to keep the strings in tune. While the concept was sound, the end result didn't make it big. Screw stringers are tuned by turning the pins in the opposite direction of other uprights (why, I don't know) I don't know if the screw stringers made it into the 20th century ... if it has a traditional pinblock, that may have dried out. A piano that does not hold its tuning is worthless.
6. How are the bridges, bridge pins, hitch pins, soundboard, & ribs? Bridges, especially an offset bass bridge, can delaminate from the soundboard. bridge pins carry a lot of bearing load side to side, and sometimes cause the bridge cap to crack. hitchpins can pull free from the plate, soundboards can crack, ribs can work loose.
That's the internal ... then there's the case work ... appliqués and veneers have a horrible habit of working loose from the case. I imagine that the varnish is probably pretty well crazed and darkened by now, unless the instrument was refinished on the last go 'round. Ivory keys are probably chipped and or have missing sections. How are the ebonies? Any missing?
Not meaning to be all doom and gloom, but there are conditions that will determine if the piano has any real value.
... look to http://www.ptg.org to find a registered piano technician in your area.
Only a technician acquainted with piano sales in your area can give you an honest assessment of the instruments potential salablilty. With restoration this might fetch a better price as an antique than as a piano.