This vintage card is an ad for dog biscuits.
It is also a tool for remembering the musical term
"Allegro" - to play music fast, quickly and bright.
The idea behind the ad is that if the card was pretty (Gold frame edge) &
it helped children learn musical terms; then mom's would remember the ad
and give the card to the children.
Or,
as was popular at the time;
the card would be placed in a scrap book.
Scrap books were often shown and shared with friends.
Each time the scrap book was shown to a friend the ad was seen again.
Wellcome Collection
183 Euston Rd, London NW1 2BE, United Kingdom
©: listed as Public Domain CC mark 1.0
CC Mark 1.0 info can be found here
https://creativecommons.org/publicdomain/mark/1.0/