Parautoptic lock, by Day & Newell, Manhattan, New York, New York State, United States of America, 1851. Exhibited at the 1851 Great Exhibition, London, England. Despite many attempts, there is no record that this lock has ever been picked. Parautoptic lock, exhibited at the 1851 Great Exhibition Locks & Fastenings 1851
Horizontal mortice lock (Butters system of 1955) by Josiah Parkes and Sons Ltd. Locks & Fastenings 1978
3-wheel keyless combination lock, model M6730 MP, by Sargent and Greenleaf, New York, U.S. A., with combination changing key, c.1949 3-wheel keyless combination lock Locks & Fastenings 1949
6020 pin- tumbler cylinder mortice lock, one of two, with key. Yale lock, 1860-1970. Locks & Fastenings 1860-1970
Tann's 3 1/2 inch reliance guarded five lever flush latch with key. Tann's 3 1/2 inch reliance guarded five lever flush latch Locks & Fastenings