It is not a typewriter - it has no letters on the keys! It is a mechanical adding machine; a quite late hand-cranked one (from just before they went electric) as it has a ribbon printer. The key-board and internals of this one are pretty much the same as the first wooden-box versions of the Felt & Tarrant 'Comptometer'. It was an ancestor of the desk-top and pocket calculators, which of course have been succeeded by the pc, tablet and mobile phone...
This was how the World worked before Clive Sinclair changed it for us all. The principal was invented in France in the mid 1600s, but made economic in your country in the 1880s. It is an amazing box full of cranks, pulleys and levers. Every bank, office and Government department had rooms full of women 'comptometerists'. The machines, could (still can) perform addition, subtraction and quite complicated multiplication and long division calculations, and quickly too with the right operator. Doesn't look as though this zoo/museum attempted to tell the story?
