31876 stamped on arm. Date of 1/27/05 stamped under body of crank.

A quick learner from Saint Ignace, MI says:
Looking for what replacement I need. Arm is around 4 7/8". Body is around 5 1/8" wide.
Thumbnail of the uploaded file named 20220128_182758.jpg
Thumbnail of the uploaded file named 20220128_182736.jpg
Profile picture of Bob
Bob from SWISCO responded:

See our 39-220B and 39-221B Split-Arm Operators. These look quite similar; just make sure the dimensions match. For new cover and handle kits, see our 39-375 & 39-376 , or our 39-451 & 39-452 , depending on the style you prefer. 

How to install an Encore dyad operator
How to install an Encore dyad operator
VIDEO
WATCH >
Anatomy of a casement window
Anatomy of a casement window
VIDEO
WATCH >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 4-7 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.