Casement window operator identification help

Question

There is a shield shaped emblem stamped into the crank handle. I cannot for the life of me read what it says. On the operator arm is the word truth. measurements are in the pictures. I should mention the window is really old. Came with the house when I bought it 16 years ago.

Thank you for all your help!

Bob · Accepted Answer

This looks like either a 39-253RB or 39-439B. The key difference between these two operators are the appendages at the end of the straight arms. The 39-253RB uses a square track slider sold separately, our 39-529, while the 39-439B uses a rectangular black slider that comes built-in to the straight arm. This slight difference effects window compatibility, so be sure to confirm what you have.