I am looking to have a spare key made for this Sargent & Greenleaf prison / jail cell lock:

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Solid bronze body
80 series, I checked with S&G and this lock is no longer in production
Key works well from both sides
Lock Body is 4" x 5-1/2" x 1-1/2"
Lock Bolt is 2" x 3/4"
Throw is 3/4"
Marked MK 600 (not sure what that means...)

Please PM me if you are able to make a duplicate key for this lock. I will mail you the original key to copy. If you cannot duplicate this key then please let me know who or how I could go about getting it duplicated.

Thanks,
VaultDoors