Need to replace 12" mortise lock 147-M-005

A quick learner says:
Locking mechanism is not working. Need to replace with keyed lock.
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Casey from SWISCO responded:

Hello,

Take a look and compare the specifications of the 82-260 mortise lock to your assembly. It looks like your original handle set has a housing for a key lock. If so, take a look and compare the 82-310 to the original. Thanks for posting! 

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