No name, numbers or stamp to identify manufacturer of this window crank for a casement aluminum bathroom window unless it was painted over by previous owner.
Dave Sr. from SWISCO responded:
June 15, 2015
There are two operators that come to mind when I look at your pictures: the 39-001 and 39-045. Personally, I'm leaning towards the 39-001, but take a look at both and let me know what you think.