SARGENT 8225 mortise lock.
• Key outside or thumbturn inside retracts and projects deadbolt
• Trim from either side retracts latchbolt, when the deadbolt is in the retracted position
• Trim outside is locked, when the deadbolt is projected
• When deadbolt is projected, Trim inside retracts latchbolt and deadbolt simultaneously, unlocking outside trim
• ANSI F13