Landscape Orientation - ie. GB1380, GS1380
Portrain Orientation - ie. GB1380-P, GS1380-P

GB1380 - means landscape sensor orientation with in-line connectors. GB1380C is the color version.
GB1380-P - means portrait sensor orientation with in-line connectors. GB1380C-P is the color version.
GB1380-V - means landscape sensor orientation with vertically orientated connectors. GB1380C-V is the color version
GB1380-PV - means portrait sensor orientation with vertically orientated connectors. GC1380C-PV is the color version
