Window operator for jalousy window

A home owner from bradenton, fl 34207 says:
Stamp marking "I L C"

I am trying to replace all window operators and crank handles as I rehab the entire home. There are 21 windows like this throughout the house.
User submitted photos of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting! Just wanted to let you know that we are currently working on a possible replacement for this operator and hope to have it online for you to look at very soon.

However, I'm not sure what handle you need. can you tell me the length of your existing one?
Profile picture of Tom
Tom from SWISCO responded:
Just to let you know, we just added our new 39-253 and 39-234 are now online and available to purchase. I just need to know what size handle you have and I can recommend a replacement for that as well.
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