Registry numbers are utilized by Schlage to identify a factory master keyed system. Beginning in the 1920's, Schlage assigned each master key in a Schlage factory master keyed system with a unique registry number. Each master key ordered from the factory was then stamped with this registry number.
Registry numbers varied in length but were typically 6-10 digits long and were preceded on the key by the letter R.
As of Monday, April 24, 2023, Schlage no longer assigns registry numbers to new master keys. Instead, all newly created master keys are to be stamped with the structure number of the master key system. If older master keys are ordered, their original registry number will still be stamped on it.
Structure numbers stamped on keys are 8 digits long - the first two digits are the year, then the letter R, then there are 5 numerical digits, e.g. 23R90021, 24R80303,
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