While Elgin’s iconic No. 49 railroad dial is generally seen in a double-sunk form, the company also furnished a single-sunk variant.
The 1909 Material Catalog Supplement indicates that the No. 2637 dial, later reassigned the “No. 49” classification, was offered at $24 per dozen in double-sunk hard enamel while the single-sunk was priced at $9 per dozen.