Andersen Long Tandem replacement Lock,
Left Hand for Perma-Shield Improved/E-Z Casement.
Used on casement windows that are 5 to 6 feet tall.
Metal lock not the older plastic variety.
Fits windows manufactured 1999 - present.
Part number usually located on handle shaft.
Handing: Left and Right Handed, as viewed from outside

Note: windows are viewed from the outside - Left Hand (LH) Window HINGES on the left.

Measurements:
See Additional images - 

Related Andersen Window Parts:
1351433 Left Hand Single lock window
1351434 Right Hand Single lock window 
1351435 Left Hand Short Tandem lock C4 & C45 and smaller windows
1351436 Right Hand Short Tandem lock C4 & C45 and smaller windows
1351438 Right Hand Long Tandem lock C5, C55, C6 windows