Looks like a tilt window sash pivot, very similar to SWISCO product code 36-318.
Do you think this replacement pivot bar could work?
A quick learner from Garfield, Arkansas says:
April 11, 2012
Hi Donna,
I am not sure. The space between the holes & the overall length seem off from my part. I'm going to place an order for other parts and order one 36-318 to see if it will work.