Another symphony, K. 45a, commonly known as "Old Lambach" and once thought to have been written several years later, was also written in The Hague, possibly for the Prince's coming-of-age concert.
Outra sinfonía, a KV 45a, comunmente coñecida como Alte Lambacher e que se pensa que puido ser composta varios anos máis tarde, tamén foi escrita na Haia, posiblemente para o concerto do príncipe.