Find WebLogic Server Version
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Methods:

1) 

Got to server installation directory “Oracle/Middleware/wlserver_10.3” open the “.product.properties” file then search for WLS_PRODUCT_VERSION Value

2) 

Go to directory which contains weblogic.jar ($WL_HOME/server/lib) and run below command
    java -cp weblogic.jar weblogic.version
    Use 'weblogic.version -verbose' to get subsystem information
    Use 'weblogic.utils.Versions' to get version information for all modules

3) 

java weblogic.Admin -url t3://localhost:7003 -username weblogic -password weblogic1 VERSION

WebLogic Server 10.3.5.0.6 PSU Patch for BUG14736140 Mon Nov 05 13:59:29 IST 2012
WebLogic Server 10.3.5.0  Fri Apr 1 20:20:06 PDT 2011 1398638

4) check the registry.xml file after installation of WebLogic server product