Adam Hutton of the Harwich Police Department said. Discovered by a woman who was walking a trail, the Baldwin Acrosonic piano, model number 987, is intact - and, apparently, in tune.Baldwin Piano & Organ Center the Midwest's Premier Showroom since 1937 0 Items - $0.00 My account / Register Baldwin Piano & Organ Center.Upright Baldwin Piano - Hamilton Limited Edition - Queen Anne Oak - GORGEOUS!!! $6,495.00.Baldwin SF10 Grand Piano- FREE Shipping! - musical instruments - by. YEAR: 1976 (Certified Rebuilt/Refinished, 2019)* LENGTH: 7′ SERIAL#: 215039 FINISH: Satin Ebony.On Steinway upright pianos the serial number can be located on top of the wrestplank above the cast iron plate when you open the lid. On Steinway grand pianos the serial number can be found on the cast iron plate between the tuning pins above the keyboard. To determine the age of a Steinway piano we need to first locate the serial number.