No, 'groovy' isn't our description, these actually go by the name of Artifort Groovy Chairs, a 1973 design by Pierre Paulin.
The chairs are still being made, priced at £1,309 each online (we've just checked – and that's in the sale), although that's obviously for brand new versions. These aren't that. According to the seller, the pair on offer here are in 'good condition' but suffer from 'some discolouring/fading to the fabric'.
So not perfect, but structurally sound and design classics. The pair is available online for a 'buy it now' of £575 or you can make an offer.
Find out more at the eBay website