I do not know the brand name of the window, Type of window is casement. On the back of the part The text included in the cast steel: MADE IN USA.
Pictures customer sent in below.
That looks to be part number 119 Right Hand - see the link below so you can verify with yours using the manufacturer drawings. We also have pictures labeled with handing for what is considered Right hand and Left hand per the manufacturer.
The triangle part at the end of the arm is part number 187. I’ll sent link to it as well. Or it can be removed from your existing operator and reused- in the 119 link at the bottom of the page are how to videos showing how to remove it.
Links to verify and use to place your order when ready: