Serial Number Dates: 1890 - Present History: Established in 1862, The Baldwin Piano Company continues to be one of the major American manufacturers of grand and baby grand pianos.Baldwin Acrosonic Supreme Tone Spinet Piano, 36 inches tall, bearing serial number 527747, manufactured in 1953. The serial number on a Baldwin Piano is located on the inside of the piano on the iron frame near the top of the strings and pinblock.The Fender American Professional II Performance, Innovation, Craftsmanship This piano is a great buy for the person that knows what their buying. This 1943 Baldwin Spinet Acrosonic Piano valued at $2,300 serial number 355103 used.