This is a very fine Instrument. It is an antique but it is a seriously fine playing piano it's actually hard to believe that an instrument that is over 100 years old can play and sound so well. This could be an excellent investment for you too.
Here is the notes from an appraisal one by Jeff Ackerman (Ackerman's Piano Sales and Restoration) in 2013
1912 Steinway Grand L African Mahogany 5'11" Serial #156841
This very nice piano has been completely restored about 20 years ago. The case and bench were refinished. The bench is original.
High Points (excerpt from appraisal): When it was rebuilt it had new strings, tuning pins, pin block, damper, hammers, shanks, and flanges, repetition levers and key bed felt replaced, the keys have been rebushed, dampers and action fully regulated. All was to new condition, original sounding board is in very good condition, no cracks visible, back cheeks are in good condition, ivory key tops are in very good condition & no chips.
The worlds finest pianos. Don't settle. http://www.steinwaypianos.com/159-facts-about-steinway-and-the-pianos-they-build