Andersen Perma-Shield Gliding Door Key lock 1999 - Present.  
Replaces products manufactured 1987 to present.
Newbury/Lock Outside keylock w/ housing
Schlage Key way, 2 keys.
Brushed Chrome
Left-Handed

NOTE: Door handing is determined by which door slides as viewed from OUTSIDE.

Gliding patio door lock assembly with keys. Lock assembly is left hand as viewed from exterior side of door. 

Works With:
200 Series Narroline Gliding
200 Series Perma-Shield Gliding
400 Series Frenchwood Gliding

Related Andersen Window Parts:
2573070 - Andersen Window Newbury lock assembly with keys for Left Hand - Bright Brass
2573071 - Andersen Window Newbury lock assembly with keys for Left Hand - Antique Brass
2573072 - Andersen Window Newbury lock assembly with keys for Left Hand - Polished Chrome 
2573073 - Andersen Window Newbury lock assembly with keys for Left Hand - Satin Nickel
2573074 - Andersen Window Newbury lock assembly with keys for Left Hand - Oil Rubbed Bronze
2573080 - Andersen Window Newbury lock assembly with keys for Right Hand - Bright Brass
2573081 - Andersen Window Newbury lock assembly with keys for Right Hand - Antique Brass
2573082 - Andersen Window Newbury lock assembly with keys for Right Hand - Polished Chrome
2573083​​​​​​​ - Andersen Window Newbury lock assembly with keys for Right Hand - Satin Nickel
2573084 - Andersen Window Newbury lock assembly with keys for Right Hand - Oil Rubbed Bronze
2573085 - Andersen Window Newbury lock assembly with keys for Right Hand - Brushed Chrome

Article:
How to Change the Handing on an Andersen Exterior Keyed Lock
Article:
How to Replace a Sheared Tailpiece Receiver in a Lock on an Andersen Sliding Patio Door