Storm door handle. Cast into the handle is "Ideal DX-1C and D-423,320 US Pat 5149154
A home owner from Kansas City Missouri says:
May 11, 2014
The door handle is broken and needs to be replaced. The handle is 6 and 7/8ths inches in length and 2 and 3/8ths inches in width. It is silver in color but any color that is available will do.
Paul from SWISCO responded:
May 15, 2014
Thanks for posting!
Take a look at the 40-152 Pull Handle Set and see if that matches your original set.