Myrtle's cook

The delicate ends, the chambers etc have a strong resemblance to a recently listed (and sold) Anglo on Ebay that was subject to discussion elsewhere on Concertina net (sorry, couldn't find link). This too was un marked with Jeffries proposed as a possibility. Ebay link: http://www.ebay.co.uk/itm/Antique-concertina-Needing-restoration-/110867554655?pt=UK_MusicalInstr_Keyboard_RL&hash=item19d038a15f Your similar Duet looks a very nice box.

In response to a question the vendor says the ends are 16cm in width. Perhaps too small to be a bass?