If you want a clock with real impact, this extra large Bodet BT630 flip wall clock could be the ideal purchase.
A vintage item, probably from the 1970s, this is a classic flip clock, but one that's sized at 34 x 25cm, which is certainly going to dominate a wall. You will need to do a small amount of work to get it to work though – it was originally a 'slave' clock, so you'll need to pick up a 'slave clock impulser', which are available on eBay separately. The clock has been tested as working by the seller though.
In terms of condition, it has 'only marginal signs of wear' and is described as being in 'near new condition'. So well worth checking out if you like the look. Currently, the price is just £1.
Find out more at the eBay website