Lock handle

Thanks for your post! The lock handle you have here appears to be the 39-291 Andersen Lock Handle. If you are looking to replace the entire assembly, I would suggest taking a look at the 38-147 and 38-149 to see if either of these is the right fit.

You'll need to compare the length and the other details of your lock to confirm which of these is the right fit (the 38-149 is used on casement windows measuring that greater than 52-13/16" and less than or equal to 71-13/16"). 

I've also tagged the opposite handed versions below and other compatible parts below.

Alternate image for 38-147

Alternate image for 38-149