J.E. Dallas was a U.K. based stringed instrument maker.

From an eBay listing of a Mandocello and Mandobass.

“Born in 1856 John E. Dallas started to make banjos with J. E. Brewster in a small workshop in London’s Oxford Street in 1873 and two years later set up as a publisher and banjo maker at 415 Strand, from which address it is said he made banjos for the Moore & Burgess Minstrels and the Mohawk Minstrels. Dallas was a fine wood craftsman who fashioned some exceptionally high-class instruments.

Demand for his instruments made it necessary for him to take over the entire premises at 415 Strand; enlarge. his workshops; and employ men to make the large range of instruments he had put on the market. For some years he advertised that he personally tested every instrument before it left his workshops. At the height of the banjo boom he was making banjos and zither-banjos for other firms and teachers and some of the latter whose “branded” instruments were made for them by Dallas included W.H. Plumbridge (Brighton), J.E. Brewster (London) and Norton Greenop (London). In 1905-6 the three sons of John. E. Dallas were rewarded for their work with the firm and were given directorships and the firm’s title changed to John E. Dallas & Sons. In February 1914 the firm moved to 202 High Holborn.

The Mandobass has what seems to be rosewood veneered back and sides, the top is of spruce, the fingerboard is ebony with pearl finger dots, it has 19 frets. The front of the head is ebony, the neck and back of the head are maple. It has twin sound holes in each rib.”

Back Length 38″
Neck to the top of the body 18″
Playing String Length 41.5″
Overall Length 66″