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Alarum Lock
Artifact No. 346 - Alarum Rim, apprentice/exercise. D: 19th century. CoR: France.
Sz: 229 x 144 mm (plus bolts and knobs). Mt: brass, steel. Wt: 3.322kg.
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Only just found this thread. Around the turn of the century, Yale began exporting a small-case cylinder rim latch to Britain. Several British makers copied this, as the early patents had expired....
CHUBB rim lock