2.5W single-8 student amp from the dark-brown 100-series update.
Marks that can be entered for this maker: Transformer code.
Nothing predates 1955; 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 — magnatone