To locate the serial number on a vertical piano, open the top and look inside.
Almost all of them include the serial number on the plate in a small "window" near the tuning pins.
Although the Arts & Crafts design was very popular during the early 20th century, piano makers were slow to adapt to the Mission/Arts & Crafts design.
After the turn-of-the-century, tastes began to change and piano design began to become a bit more streamlined.
The ostentatious styles of the late 19 century saw a calmer, less radical movement in interior design than the previous decades, and this change was immediately seen in the evolving styles offer by the major piano manufacturers.
To make sure that you have all of the information you will need, open the lid of your piano and check out the name or names engraved or printed on the plate.
Do NOT trust the name on the outside of the piano since in could have been refinished and a different name added.