it is mico blind window theirs is 1 stamped on the bottom
the lock is on the left of
3 13/16 center to center of holes left to right
3/4 center to center back to front
Tom from SWISCO responded:
August 24, 2016
This looks like the base for a Pella casement window operator. See our 39-096 or 39-176, depending on the style of the arms.