: 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

Looking for a specific linked to that ISSN or ORCID. Laura R Shapiro (0000-0002-3276-457X) - ORCID

Achieving clear views at 457x requires exceptionally stable atmospheric conditions (good "seeing") and precise mirror alignment (collimation). 2. Digital Identifiers (ORCID/ISSN)

: It is characterized by high-quality grey mirrors set against a contrasting ebony (black) lacquer finish.

: The "Euro-Sled" nickname comes from its low, sleek profile and the horizontal lines that resemble a sled or a high-speed locomotive from the period.

: Unlike most radios of the era, the 457X features a bold, unbalanced geometric shape that creates a sense of movement.

Depending on the context, "457x" can also refer to specific technical or scientific markers: 1. Astronomy Magnification

Calculating to reach that magnification.