This kind of thing is being remade with a modern twist, but you can't beat an original – like the Bodet BT630 flip wall clock.
A French wall clock from the 1970s, it's reminiscent of the Gino Valle 1960s clocks, offering up a brown case, large flip numbers for the time and an automated date function too. But there's a large 'but'…
The clock was a 'slave' to a 'master' clock, not designed to work alone. However, you can buy a part on eBay to get it to work alone. Which is probably why it's only selling for £1.20 right now. But if you get it and get it working alone, it could prove a very shrewd investment.