Reissues are incredibly high priced, so the ideal of an original 1940s Kaiser Idell 6561 desk lamp for next to nothing is appealing. Which is the case right now with this particular example.
According to the seller, this is part of the Christian Dell collection, dating from the 1940s and with the original mark of the manufacturer. It's made of metal, with some flexibility allowing you to aim the light where you need it. It works too, according to the seller.
It's described as being 'hardly used' and still in 'good condition', completely unrestored though, so there is the odd blemish. Right now, the price is £1.