457x
: This specific model was produced by the Sparks-Worthington Company of Jackson, Michigan, primarily for the European market, making it significantly rarer than domestic Sparton models. 🔭 Secondary Technical Meanings
: Some academic journals use these digits in their serial numbers. For example, the online version of the journal Food Science and Technology (Campinas) uses ISSN 1678-457X . 3. Finance and Markets : This specific model was produced by the
: Unlike most radios of the era, the 457X features a bold, unbalanced geometric shape that creates a sense of movement. primarily for the European market