Marks 22 Series ornamental iron door mortise lock set.
Used primarily with steel security doors.

Important Keyway Information:
1 inch thick door option comes with a Marks "A" Keyway (Kwikset KW1)
1-¾ inch thick door option comes with a Marks "C" Keyway (Schlage SC1)

Faceplate: 1 inch x 7-1/8 inch 
Blue Lock Box: 5-1/2 inch x 3-3/8 inch. 
Backset: 2-1/2 inches (from faceplate to center of holes for lock or handles). 
Spindle: 1/4 inch (7 mm) Square
Door Thickness: standard for 1" doors; 1-3/4" optional (may take 4-8 weeks special order)
Locks: Double Cylinder Mortise lock with 2 keys (keyed on both sides)
Handles: Round inside and outside knobs. 
Colors/Finishes: Polished Brass, Satin Chrome, Antique Brass, Oil-Rubbed Bronze
Handing: Left hand reverse (if key is below handle, handleset is on the right side of the door when viewed from outside the house) 

Handing Information: 
The key can be installed ABOVE or BELOW the handle on OUTSWING security doors.
When the lock is inverted, it changes the locking function. 
Please see images for a visual reference.

Key Below: 
Viewed from outside, hinges on the left, handle on the right = right hand reverse (RHR) - see 301077
Viewed from outside, hinges on the right, handle on the left = left hand reverse (LHR) 

Key Above: 
Viewed from outside, hinges on the left, handle on the right = left hand reverse (LHR)
Viewed from outside, hinges on the right, handle on the left = right hand reverse (RHR) - see 301077

Handing CAN be changed, but it is easier to order correctly. 

Note: Door can be opened from both sides when deadbolt is not engaged, except when stop-button on face of lock is engaged. Then door can only be opened from inside but is locked from outside and can only be opened with a key. Deadbolt can be engaged or disengaged with key from either side. The deadbolt deadlocks the latch. 

Please see additional pictures for more information. 

Resources:
How to change a right handed reverse lock to a left handed reverse lock (and vice versa)

Priced and sold each.