1930 PA Philadelphia Philadelphia as of Apr 7 1930
Bergen Wm head 35 married at 30 DE GER GER druggist
Bergen Margaret wife 36 married at 31 Prussia Prussia Prussia
Bergen Wm Jr son 8/12 PA DEL GERPrussia
(which means Wm Jr was born about Sep 1929)

this one seems a close match
SS Death index
William H Bergen b. 19 Oct 1929 d. 1 Jun 1993 Horsham Montgomery Co PA
this could be his father
William Bergen b. 9 Jan 1895 d. Oct 1968 Jenkintown Montgomery Co PA

this is the only Wm Bergen found born 1929 or 1930 PA and only one with parents Wm and Margaret in PA

if you go to a local LDS Family History Center you should be able to rent the Philadelphia birth records on film and once they are sent to the FHC you view them there and can make a copy