Two brothers with the world’s largest collection of cuckoo clocks are preparing to move their 750 timepieces back one hour this weekend - for daylight saving.<br /><br />Roman Piekarski, 71 and Maz Piekarski, 69, have spent five decades sourcing their amazing pendulum-driven machines, on display at their 'Cuckooland' museum.<br /><br />And it takes the pair more than a day to ensure the clocks are accurately telling the right time when daylight saving regulations kick in twice each year.<br /><br />The unmarried siblings’ remarkable hoard all come from a 25-mile area in the Black Forest, Germany, where the vintage timepieces were first manufactured. <br /><br />And among their revered collection is possibly the world’s most famous cuckoo clock, which was made for Frederick I, the Grand Duke of Barden, in the 1860s.<br /><br />Roman said visitors who come from all over the world to see his museum, in Tabley, near Knutsford, Cheshire, are often ‘gobsmacked’ by what they find.<br /><br />He said: “We love what we do. Cuckoo clocks have been a way of life for us. We work every day – Christmas is just another day. <br /><br />“We’ve been to Germany and different countries to buy clocks. We have had to hunt them down and when you find them it’s great.<br /><br />“When people leave us, they are absolutely gobsmacked. People just can’t believe what we’ve managed to put together.<br /><br />“I have a joke – ‘Never mind the Great Wall of China, we have the Great Wall of cuckoo clocks’.<br /><br />“In our 35-year history, we have never had a disappointed visitor.”