Not a mortise lock.
Two pin locking system.
Can’t find anything that looks like this.
Its a big old multi point mortise lock and it may be still available. There are a couple of models of these locks which use special screw heads to lock into the side jamb
I posted the dimensions so if you could confirm that the sizes match what you have.
Please contact me if you want me to look around around for a supplier that has one of these.
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