35W 1x15 bass amp with 2 x 7591 output tubes (1960s).
Marks that can be entered for this maker: Transformer code.
Nothing predates 1960; 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: Blue Book of Guitar Values — premier