Sargent & Greenleaf Model #4 and four-tumbler combination lock for Corliss safe, c. 1902, demo @MarkFrankclocks

Uploaded December 2018 | Updated September 2026, 2 weeks ago

Demo of a S&G Model #4 time lock and S&G four-tumbler combination lock with associated safe boltwork mounted to a Corliss left hand door mount. This artifact gives the viewer a good representation of how a time lock, combination lock and the safe boltwork all interact to provide security.

Sargent & Greenleaf Model #4 and four-tumbler combination lock for Corliss safe, c. 1902, demo

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