Just those letters, M and RThis looks exactly like your Window Crank Operator 39-002.
Letters inside the bottom: M and R
Home Owner from Berkeley CA
Dec 23, 2025 6:21 pm
2 user uploaded images
2 Replies
Dave Sr. from SWISCO
Jan 5, 2026 9:30 am
Hello,
I agree that your operator resembles the 39-002, but you'll need to confirm that the measurements below match your assembly. If needed, we also offer the bottom-mounted 39-504 track for this assembly. Thanks for posting!
Dimensions for 39-002
Alternate image for 39-002
Alternate image for 39-504
Alternate view of 39-504
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