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pendulum clock wood piece:170pcs; assembly time:about 6 hours. recommend age:14+,children under the age of 14 can complete the assembly accompanied by their parents. certificates:en71,ce,fsc,fcc; product show production details follow the english instructions step by step.it takes about 6 hours to complete. screw the clockwork to the end,the clock can run for few hours. laser precision cutting,assembled by buckle,each part has corresponding code, which makes the assemble easier. ass...