Window Sash Lock

A home owner from Powhatan, VA says:
Part says 9311 A-S PA with a B at the bottom of the lock. Measurements between the holes I believe is 2 1/8 and from the hole to the back of the lock measures 11/16.
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Bob from SWISCO responded:

See our 90-278. This has hole spacing of 2-1/16". Double-check yours; be sure to measure from the center of each mounting hole. Many thanks. 

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