The original hand-built Standel: knobs on top of the cabinet, padded naugahyde, aluminium guards and a lighted control panel, each one custom-ordered.
Marks that can be entered for this maker: Transformer code.
Nothing predates 1953; components only push the date later.
Sold-price aggregates are not collected yet, so the archive gives no figure — condition, originality of the transformers and a documented recap move this model more than any list price.
Evidence: Standel — maker history