Vintage Stanley Cabinet Hardware Door Magnetic Catch 40 ALD. New Britain, CT.. Condition is New Old Stock.
Package reads:
Aluminum Cased Magnetic Catch.
Satin Alumilite Finish. 40 ALD. ONE Only.

Package was sealed with a staple
I opened to make sure the part was complete. Includes the screws and instruction page.  This was found in a large pot of pre 1950s tools and fasteners. Produced in New Britain, CT The Stanley Works.