Horizontal mortice lock (Butters system of 1955) by Josiah Parkes and Sons Ltd. Locks & Fastenings 1978
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
6020 pin- tumbler cylinder mortice lock, one of two, with key. Yale lock, 1860-1970. Locks & Fastenings 1860-1970
Chatwood "Invincible" patent pivoted-stump fire chest lock with key. Six lever double bolt Locks & Fastenings
Key, for Parautoptic lock, including: Display-set of fifteen changeable Key-Bits; Key-Bits Spindle; Key Shaft Spindle, with decorative end; and Chain attached to Key, by Day & Newell, Manhattan, New York, New York State, United States of America, 1851. Exhibited at the 1851 Great Exhibition, London, England. Key, for Parautoptic lock, exhibited at the 1851 Great Exhibition Locks & Fastenings 1851
Mortice Sash lock (Butters System of 1955) by Josiah Parkes and Sons Ltd of Willenhall Locks & Fastenings 1978
