Need to identify hinge part for Pella Casement window - need to know if it RH or LH hinge

A handy person from San Carlos, California says:

Purchased this Pella casement window in 1999 and need to purchase a hinge for this window. The picture is of me facing the window/ window swings open to the left.
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Bob from SWISCO responded:

The left and right hinge is determined from the exterior of the window, not the interior. I am afraid though that your best bet is to remove yours from the window and compare it to our pictures. There's just too much variation based on the exact setup of the window otherwise. At any rate, you'll need to remove the hinge anyways to get the exact dimensions. See the list I've placed on this page. 

39-351 : LH 9-5/8
LH 9-5/8" Hinge Arm Assembly, Pella
39-352 : RH 9-5/8
RH 9-5/8" Hinge Arm Assembly, Pella
39-363 : Pella Pivot Plate Hinge Shoe
Pella Pivot Plate Hinge Shoe
39-371 : Pella Hinge Shoe Pair
Pella Hinge Shoe Pair
39-394 : LH 10
LH 10" Hinge Arm Assembly, Pella
39-395 : RH 10
RH 10" Hinge Arm Assembly, Pella
39-396 : LH 12-1/8
LH 12-1/8" Hinge Arm Assembly, Pella
39-397 : RH 12-1/8
RH 12-1/8" Hinge Arm Assembly, Pella
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