Looking for my 45001 Window crank handle

This is kind of a weird setup. At first glance, your operator and window look like they're Pella brand. However, your handle looks like it could be Truth brand, especially because of that stamp. Is the handle loose on the operator? If I'm right, I'd imagine they don't really fit together really well.

I'd like you to confirm the diameter of the operator stem over which the handle fits. If it's 3/8" in diameter, then you have a Pella operator and I recommend our 39-109B as a replacement. If it's 11/32", then you have a Truth operator after all and I'd recommend our 39-114L instead.