Horizontal window in bathroom

This awning window operator reminds me of either the 39-083 or 39-140 Dual Arm Crank. To determine which of these is the best replacement match, you'll need to be sure to confirm the wingspan measurement of the operator arms. 

The compatible bracket is the 39-170 Window Sash Bracket and if you are looking to replace the handle you can use the 39-114L Crank Handle.

Dimensions for 39-083

Dimensions for 39-140