Modern turret timepiece, fitted with Grimthorpe’s double three-legged gravity escapements, Gillett & Johnstone Ltd, Croydon, Surrey, England, 1945-1952. Grimthorpe’s escapements made in 1849-1859. Turret timepiece fitted with pendulum, driving weight, chain and counter weight, and switching weight, chain and counter weight. Turret Timepiece with Grimthorpe’s Gravity Escapements, 1945-1952 1945-1952; 1849-1859