In his letter of 28 June 1764, Leopold writes of engravings of the sights of Paris and London that he collected during the family’s tour to both cities in 1763-1764:
- . . . in due course I shall
– God willing – show you some copper engravings not only of these places [in
London] but of many other things both in Paris and London. You can then have a
fuller explanation of them. I’ve left a number of copper engravings in Paris
that are worth 2 louis d’or.
The engravings from Paris are lost. The engravings
from London, however, survive (possibly incompletely) in the library of the
Salzburg Museum. The original catalogue card reads: 'Copper engravings owned by the Mozarts'. A further note, in an different hand, describes: ‘A number of copper engravings that father Leopold Mozart purchased during his artistic tour in London, Brussels, Paris and Naples in 1763, as well as an English pryaer book purchased in London.’ The Brussels,
Paris and Rome engravings do not survive; nor does the small prayer book. It is
likely that the surviving engravings derive from the estate of Mozart’s sister,
Nannerl, whose estate inventory included '28 Italian prospects with glass and frames', 2 Dutch pieces, 12 landscapes, 2 landscapes showing the Tower and Calais, 2 ditto Italian, 3 prospects of the city of London.'
 See Rudoph Angermüller and Gabriele Ramsauer, ‘”du wirst, wenn uns Gott gesund zurückkommen läst, schöne Sachen sehen.” Veduten aus dem Nachlaß Leopold Mozarts in der Graphiksammlung des Salzburger Museums Carolino Augusteum’, Mitteilungen der Internationalen Stiftung Mozarteum 42/1-2 (1994), 1-48; Rudolph Angermüller, ‘Testament, Kodizill, Nachtrag und Sperrelation der Freifrau Maria Anna von Berchtold zu Sonnenburg, geb. Mozart (1751-1829)', Mozart-Jahrbuch 1986, 121.