A contractor from billerica says:
March 4, 2016
this is a pivot bar numbers on it are 1450-3 on one side and 1638 on other side
Paul from SWISCO responded:
March 7, 2016
Thanks for posting! I believe the Harvey window company made this pivot bar once upon a time, but have since phased it out in favor of our 26-164 and 26-416. However, I don't think you can use either one in your window. If your pivot shoe looks like our 15-208, see if you can substitute your pivot bar with either our 26-021 or 26-433, depending on the distance of the mounting screw hole.