Handel's authorship of this Sonata is uncertain, and RISM lists it as "Anonymous"
||The Archive of the Sing-Akademie zu Berlin (D-Bsa): SA 2492.
||Quadro Sonata in B-flat major
||Sonata a Quatuor Stromenti Obl.
A note by Zelter is on the title page. It reads "Von schlechter Hand aus einem Trio ein Quadro gemacht und wenig zu gebrauchen." ("By a bad hand, from a Trio a Quadro was made and is of little use"). I couldn't identify the "Trio" the arrangement was based on. Perhaps it is not a Trio by Handel, but another composer. TW.