I'm not sure it is the right birth's date. Actually, it is the birth's date of Leopold Kopperl son of Alexander Kopperl and Marie Jerusalem (see HBMa 1133 image 101 n218 http://www.badatelna.eu/fond/1073/reprodukce/?zaznamId=1499&rep...
Indeed!! Josef son of Alexander & Marie is a separate profile: Leopold Kopperl
Please check again, to see if I have corrected the mistake properly,
Peter
it seems OK. Thanks