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What type of lock is this? Found on old, high end doors...


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A most unusual key is that for the O'Dell night latch invented around 1792 (although this was the first British version as the French were making this type of latch in the 17th century). As shown by the brass front of the latch it is has a spade shaped key bit. This enters the inverted “T” shaped slots and passes into the back where it is lifted through the wards shown in the R.H. photo to lift a latch.

http://www.lockcollectors.eu/members/keys/_index.htm

http://www.lockcollectors.eu/members/lockdatabase/unpatented/_index.htm

https://www.google.com/imgres?imgurl=http%3A%2F%2Fancientpoint.com%2Fimgs%2Fa%2Fi%2Fo%2Fo%2Ff%2Fd_antique_o__dell__s_french_latch_and_key_latch_af_rare_1_thumb2_lgw.jpg&tbnid=jUbGox72cYYllM&vet=10CAsQxiAoAWoXChMIiMDggLPahgMVAAAAAB0AAAAAEAc..i&imgrefurl=http%3A%2F%2Fancientpoint.com%2Fcategory%2F46-antiques_architectural__garden_hardware_locks__keys_%2Fpage_4.html&docid=k5TlrDhcDA5DaM&w=320&h=240&itg=1&q=lock with t shaped key&client=firefox-b-1-d&ved=0CAsQxiAoAWoXChMIiMDggLPahgMVAAAAAB0AAAAAEAc#imgrc=jUbGox72cYYllM&imgdii=6AI2_7XDkUz7cM

http://ancientpoint.com/inf/150570-d_antique_o__dell__s_french_latch_and_key_latch_af_rare.html

https://www.queens.cam.ac.uk/visiting-the-college/history/college-facts/the-buildings/french-night-latches

https://www.etsy.com/listing/1220379096/odell-key-1819th-century-edinburgh?show_sold_out_detail=1&ref=nla_listing_details

https://www.google.com/search?client=firefox-b-1-d&sca_esv=b6768ec4eb9a166c&sca_upv=1&q=O+Dell+night+latch&udm=2&fbs=AEQNm0AbzhUJjXv6jRup8eVc0BvPyH5PazCaW205cG-Bd0in0SeU-Q4GVbDidOCCAlv8ddwnuh7lPh3aYhqMJdmlhqKO8rDglsPvyMjbq9rCVLJ_yLz05yoyCj0IoTno93uYggnfsWN1FM92F-TFvqgBlLlmP8zrNwNJEd3LcLFp9n7dqviEvbckZCE_JI4OCNw2SzCBq6GPkqgWkri4s4r_BLQYM2Jsmw&sa=X&ved=2ahUKEwj7y-KVtNqGAxXhEUQIHQljA6oQtKgLegQIEBAB&biw=1920&bih=927&dpr=1

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