A home owner from cherry hill, nj says:
March 31, 2013
only markings are 488 inside large exterior handle. told to contact you by Jerry at Ace hardware in cherry hill,NJ
Dave from SWISCO responded:
April 2, 2013
Thanks for posting! Have you seen our 40-142? This appears similar to what you have, but I can't be sure without more detailed dimensions. Take a look and see what you think.