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Curt Herzstark and His Pocket Calculator CURTA
- DanBC 7y agoCURTAs are collectable and thus really expensive. If you just want a mechanical device full of cogs and gears and springs you can pick up old bus ticket machines. Something like the Almex Bell Push: https://www.ebay.co.uk/itm/Antique-Almex-Bus-ticket-machines/323853922334?hash=item4b6732b01e:g:LLUAAOSwCd9dI8X0 https://www.ebay.co.uk/itm/Antique-Almex-Bus-ticket-machines...