This is a vintage Wm. Kratt Co. “Blow-Accordion” toy musical instrument (a type of mouth-blown harmonica or novelty whistle/flute styled like a small accordion). Wm. Kratt Company (based in New Jersey, USA) was a notable American maker of harmonicas and pitch pipes from the early-to-mid 20th century, famous for innovations like plastic combs in the 1950s. This particular model dates to around the 1950s (based on the Western/cowboy-themed box art, “All-American Made” branding, and similar advertised items from that era). It’s a simple plastic or composition body toy with reed(s) inside—blow into the mouthpiece to produce notes/sounds, often marketed as a beginner or novelty “accordion” for kids.