If you open the top, you should be able to see numbers, which may tell us the date. It looks like twenties.
1914 #13,400 Strohmenger & Sons piano has 3.4.14 written on the keys, and is also thought to have been a wedding present to the owner's parents in 1914.
1914 #13,700 Strohmenger & Sons piano marked 9.11.14F on frame: Action made by Lexow, and its numbers also confirm the year.
1926 #17,036 J. Strohmenger upright player piano is dated 30th September 1926.
If you want to search inside the piano for clues, have a look at